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Magnetic Properties And Electronic Structure Of Rare Earth Transition Metal Inter Metallic Compounds
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Book Synopsis Magnetic Properties and Electronic Structure of Rare-earth-transition Metal Inter-metallic Compounds by : Antônio Augusto Gomes
Download or read book Magnetic Properties and Electronic Structure of Rare-earth-transition Metal Inter-metallic Compounds written by Antônio Augusto Gomes and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Crystal Structures and Magnetic Properties of Rare Earth Intermetallics by : Andrej Szytula
Download or read book Handbook of Crystal Structures and Magnetic Properties of Rare Earth Intermetallics written by Andrej Szytula and published by CRC Press. This book was released on 2020-07-09 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare-earth intermetallics, also known as lanthanide elements, play an important role in the study of magnetic materials and the development of semi- and super-conducting materials. This handbook provides an up-to-date compilation of crystallographic, physical, and magnetic data on rare-earth intermetallic compounds. Over 20 different structure types are described in detail with an emphasis on how crystal structure can affect magnetic properties. Theoretical models for magnetic interactions are described as well as the impact of crystal electric fields on transport properties, magneto crystalline anistropy and hyperfine interactions. This book provides materials scientists, engineers and physicists with all the critical information needed to use rare-earth intermetallics effectively in the development of new materials.
Book Synopsis Photoemission Study of the Rare Earth Intermetallic Compounds by : Jongik Park
Download or read book Photoemission Study of the Rare Earth Intermetallic Compounds written by Jongik Park and published by . This book was released on 2004 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronic structures of EuNi2Ge2 and GdNi2Ge2 have been investigated using photoemission spectroscopy. The majority of the photoemission intensity near E[subscript F] was due to the mostly Ni 3d states in both materials. CIS spectra were recorded at selected initial-state binding energies (BEs) across the excitation energy range of the Ni 3p threshold in EuNi2Ge2. It is apparent that there is strong Ni d character throughout the valence band from CIS spectra. Resonance measurements of the Eu 4d[Reaction goes right]4f excitations in EuNi2Ge2 reveal that Eu 4f states are localized around 2 eV below E[subscript F]. It is observed that Gd 4f peak in GdNi2Ge2 is more tightly bound by 6.4 eV than in Eu 4f peak in EuNi2Ge2. We have seen a resonant enhancement of the Ni 3d satellite at about 7.4 eV BE, indicating Ni 3d character around the Fermi edge in EuNi2Ge2. The Ni 3d partial spectral weights (PSW) from the Ni 3p[Reaction goes right]3d RPES measurements show that they are very close to the calculated Ni 3d density of states for both materials. We have measured Constant-Final-State (CFS) and Constant-Initial-State (CIS) spectra in an attempt to check the valence of the Eu ion in EuNi2Ge2, and it is verified as 2+. The measured CFS spectra of GdNi2Ge2 was almost the same as those of EuNi2Ge2 and Gd metal, indicating that Gd ions in GdNi2Ge2 are trivalent with the same 4f7 configuration as the Eu ion in EuNi2Ge2. We present experimental energy bands mapped from normal-emission photoelectron spectra of EuNi2Ge2 and GdNi2Ge2 (001) surfaces using synchrotron radiation with increasing photon energies from 14 eV to 54 eV (to 44 eV in the case of GdNi2Ge2). Four and three major photoemission features disperse along the normal [001] Brillouin zone (BZ) direction direction in EuNi2Ge2 and GdNi2Ge2, respectively, in good agreement with the band calculations. We studied quantitatively the effects of band filling on the electronic structures by observing a rigid-band shift of E[subscript F] corresponding simply to an increase of one conduction electron upon going from EuNi2Ge2 to GdNi2Ge2. Segments of the Fermi surfaces (FSs) were mapped by ARPES in the [Gamma]XPZ plane of the Brillouin zones (BZs) for both EuNi2Ge2 and GdNi2Ge2, which are in good agreement with band calculations. We studied how the FS is changed in the [Gamma]XPZ planes of the BZ when one electron is added to EuNi2Ge2, corresponding to GdNi2Ge2, based on the rigid-band approximation. In conclusion, these compounds which give the same Hund's rule ground state (8S--[subscript /]2) were one of suitable systems for the study of effects of band filling on electric structures based on a rigid-band model as a first-order approximation.
Book Synopsis Handbook on the Physics and Chemistry of Rare Earths by : Karl Albert Gschneidner
Download or read book Handbook on the Physics and Chemistry of Rare Earths written by Karl Albert Gschneidner and published by North-Holland. This book was released on 1996 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers various physical aspects of a wide range of rare-earth materials. Magnetic phenomena dominate the contents of the first four chapters which deal with thin films and layered structures, and intermetallic and nonmetallic compounds. The remaining two chapters deal with coherent emission and electronic structure calculations of lanthanide molecules.The first chapter covers the state-of-the-art of the synthesis and properties of thin films of the rare-earth metals and layered superstructures of two rare-earth metals. The following chapter is a review of rare-earth-transition metal nanoscale multilayers and describes the recent advances in our understanding of magnetic structure, interfacial magnetism, and origin of perpendicular magnetic anisotropy of lanthanide-transition-metal nanoscale multilayers. The next chapter deals with one of the important series of rare-earth intermetallic compounds, those which possess the ThNm 12 -type structure. The authors of the following chapter review the specific magnetic and magnetoelastic properties of certain crystals, which are determined by the localized electronic magnetic moments of the lanthanide ions in the crystal lattice and their interactions with each other and surrounding ions. The chapter on coherent emission differs from other reviews on the subject in that it concentrates on the broader issues. Here the emphasis is on superradiance, superfluorescence, amplification of spontaneous emission by other stimulated emision than the laser effect and coherent spontaneous emission. The final chapter describes the progress that has been made in electronic structure calculations of lanthanide-containing molecules, especially in the last 10 years.
Book Synopsis Rare Earth Transition Metal Borocarbides (Nitrides) by : Karl-Hartmut Müller
Download or read book Rare Earth Transition Metal Borocarbides (Nitrides) written by Karl-Hartmut Müller and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains most of the contributions presented at the NATO Advanced Research Workshop on Rare Earth Transition Metal Borocarbides (Nitrides): Superconducting, Magnetic and Normal State Properties, held in Dresden, Germany at 13 - 18 June 2000. The Workshop was chaired by K. -H. MUller and V. N. Narozhnyi. This was the first meeting specially focused on the quaternary rare-earth transition-metal borocarbides and nitrides - a new class of magnetic superconductors discovered in 1994. The motivation for organizing this workshop was to bring together scientists (both experimentalists and theoreticians), actively working in this field in different countries, using different methods, to exchange their points of view on the properties ofthese materials and to recognize the directions for future research. Totally 48 participants from 17 countries ofEurope, the United States, BraZil, India, Israel and Japan took part in this meeting. In addition about 15 observers (mainly from Germany) attended. The scientific Programme of the Workshop was composed of 7 sections. The section Introduction and Overview was followed by the Electronic Structure and Properties and Phonon Spectra; Magnetic Properties and CEF Effects; Interplay between Superconductivity and Magnetism; Vortex Lattice; Thin Films; Nature of the Superconducting State in Borocarbides sections. Totally 50 presentations were given (45 ofthem in oral form). Considerable attention was devoted to the characterization of the particular place of borocarbides amongst the other magnetic and superconducting systems and, especially, magnetic superconductors.
Book Synopsis Electronic Structure and Magnetism of 3d-Transition Metal Pnictides by : Kazuko Motizuki
Download or read book Electronic Structure and Magnetism of 3d-Transition Metal Pnictides written by Kazuko Motizuki and published by Springer Science & Business Media. This book was released on 2009-12-08 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on the magnetic properties of 3d-transition metal compounds focuses on 3d-metal pnictides. It couples experimental data with phenomenological discussions and explores how certain behaviors can be explained based on an itinerant electron picture.
Book Synopsis Rare-earth Transition-metal Intermetallics by : Mi-Kyung Han
Download or read book Rare-earth Transition-metal Intermetallics written by Mi-Kyung Han and published by . This book was released on 2006 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis is to explore novel rare-earth, transition metal compounds and to investigate their structure and bonding and how these influence their properties. We have focused on the synthesis, characterization and electronic structure investigations, as well as physical properties of ternary rare-earth Fe-rich intermetallics, e.g., LaFe[subscript 13-x]Si[subscript x], and RE[subscript 2-x]Fe4Si[subscript 14-y], etc. The LaFe[subscript 13-x]Si[subscript x], (1.0 [equal to or less than] x [equal to or less than] 5.0) compounds with structures related to the cubic NaZn13−type are an important series of compounds to study for possible efficient magnetic refrigeration. A systematic structural study of the compositional variation in LaFe[subscript 13-x]Si[subscript x], exhibits a structural transformation from the cubic NaZn13−structure type to a tetragonal derivative due to preferential ordering of Fe and Si atoms. Temperature-dependent single crystal X-ray diffraction at various temperatures and electronic structure calculations (both Extended Hückel and TB-LMTO) was performed on the cubic phases to examine the origin of the large magnetic entropy change. The giant magnetocaloric effect of cubic LaFe[subscript 13-x]Si[subscript x] alloys results from coupling between magnetic ordering and structural transformation. In light of the potential superstructures that could be observed for RE[subscript 2-x]Fe4Si[subscript 14-y] as well as possible modifications of semiconducting [Beta]-FeSi2, we report herein a thorough examination of the chemical composition and structure of RE[subscript 2-x]Fe4Si[subscript 14-y] (RE = Y, Gd-Lu) using a combination of electron microscopy and X-ray diffraction, and demonstrate a new superstructure for this class of compound. The structures are built up of rare-earth silicide planes with approximate compositions "RE1.2Si1.9" alternating with [Beta]-FeSi2-derived (hkl)-type slabs. Investigation by transition electron microscopy (TEM) reveals a superstructure in the crystallographic ab-plane. Fe Mössbauer spectra confirm two different iron environments in superstructure. Magnetic susceptibilities suggest weak magnetic coupling between rare-earth elements, and resistance measurements indicate poor metallic behavior with a large residual resistivity at low temperatures, which is consistent with disorder. Electronic structure calculations on model structures identify a pseudogap in the densities of states for specific valence electron counts that helps to provide a useful electron counting scheme for this class of rare-earth/transition metal/main group compound.
Book Synopsis Handbook on the Physics and Chemistry of Rare Earths by : Karl Albert Gschneidner
Download or read book Handbook on the Physics and Chemistry of Rare Earths written by Karl Albert Gschneidner and published by North-Holland. This book was released on 1996 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers various physical aspects of a wide range of rare-earth materials. Magnetic phenomena dominate the contents of the first four chapters which deal with thin films and layered structures, and intermetallic and nonmetallic compounds. The remaining two chapters deal with coherent emission and electronic structure calculations of lanthanide molecules.The first chapter covers the state-of-the-art of the synthesis and properties of thin films of the rare-earth metals and layered superstructures of two rare-earth metals. The following chapter is a review of rare-earth-transition metal nanoscale multilayers and describes the recent advances in our understanding of magnetic structure, interfacial magnetism, and origin of perpendicular magnetic anisotropy of lanthanide-transition-metal nanoscale multilayers. The next chapter deals with one of the important series of rare-earth intermetallic compounds, those which possess the ThNm 12 -type structure. The authors of the following chapter review the specific magnetic and magnetoelastic properties of certain crystals, which are determined by the localized electronic magnetic moments of the lanthanide ions in the crystal lattice and their interactions with each other and surrounding ions. The chapter on coherent emission differs from other reviews on the subject in that it concentrates on the broader issues. Here the emphasis is on superradiance, superfluorescence, amplification of spontaneous emission by other stimulated emision than the laser effect and coherent spontaneous emission. The final chapter describes the progress that has been made in electronic structure calculations of lanthanide-containing molecules, especially in the last 10 years.
Book Synopsis Handbook on the Physics and Chemistry of Rare Earths by : Karl A. Gschneidner
Download or read book Handbook on the Physics and Chemistry of Rare Earths written by Karl A. Gschneidner and published by North Holland. This book was released on 1996 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers various physical aspects of a wide range of rare-earth materials. Magnetic phenomena dominate the contents of the first four chapters which deal with thin films and layered structures, and intermetallic and nonmetallic compounds. The remaining two chapters deal with coherent emission and electronic structure calculations of lanthanide molecules. The first chapter covers the state-of-the-art of the synthesis and properties of thin films of the rare-earth metals and layered superstructures of two rare-earth metals. The following chapter is a review of rare-earth-transition metal nanoscale multilayers and describes the recent advances in our understanding of magnetic structure, interfacial magnetism, and origin of perpendicular magnetic anisotropy of lanthanide-transition-metal nanoscale multilayers. The next chapter deals with one of the important series of rare-earth intermetallic compounds, those which possess the ThNm12-type structure. The authors of the following chapter review the specific magnetic and magnetoelastic properties of certain crystals, which are determined by the localized electronic magnetic moments of the lanthanide ions in the crystal lattice and their interactions with each other and surrounding ions. The chapter on coherent emission differs from other reviews on the subject in that it concentrates on the broader issues. Here the emphasis is on superradiance, superfluorescence, amplification of spontaneous emission by other stimulated emision than the laser effect and coherent spontaneous emission. The final chapter describes the progress that has been made in electronic structure calculations of lanthanide-containing molecules, especially in the last 10 years.
Book Synopsis Photoemission Study of the Rare Earth Intermetallic Compounds by :
Download or read book Photoemission Study of the Rare Earth Intermetallic Compounds written by and published by . This book was released on 2004 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: EuNi2Ge2 and GdNi2Ge2 are two members of the RT2X2 (R = rare earth, T = transition metal and X = Si, Ge) family of intermetallic compounds, which has been studied since the early 1980s. These ternary rare-earth intermetallic compounds with the tetragonal ThCr2Si2 structure are known for their wide variety of magnetic properties, Extensive studies of the RT2X2 series can be found in Refs [ 1,2,3]. The magnetic properties of the rare-earth nickel germanides RNi2Ge2 were recently studied in more detail [4]. The purpose of this dissertation is to investigate the electronic structure (both valence band and shallow core levels) of single crystals of EuNi2Ge2 and GdNi2Ge2 and to check the assumptions that the f electrons are non-interacting and, consequently, the rigid-band model for these crystals would work [11], using synchrotron radiation because, to the best of our knowledge, no photoemission measurements on those have been reported. Photoemission spectroscopy has been widely used to study the detailed electronic structure of metals and alloys, and especially angle-resolved photoemission spectroscopy (ARPES) has proven to be a powerful technique for investigating Fermi surfaces (FSs) of single-crystal compounds.
Book Synopsis Magnetic Properties of Rare Earth Metals by : R. Elliott
Download or read book Magnetic Properties of Rare Earth Metals written by R. Elliott and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rare earths have a unique place among the elements. Although very much alike chemically and in most phy~ical properties they each have very different and striking magnetic properties. The reason, of course, lies in their 4f electrons which determine the magnetic properties but have little effect on other chemical and physical behaviour. Although they are not rare, some indeed are among the more common heavy elements in the earth's crust, the difficulty of separation has meant that their intricate magnetic properties have only recently been unravelled. Now, however, the general pattern of their magnetism is well charted and the underlying theory is well understood. Both are thoroughly summarised in this book. It provides an excellent example of the kind of extensive synthesis which is possible with modem solid state physics. it represents only a high plateau in the ascent to complete understanding. But It will become clear to the reader that while the overall position is satisfactory there are many details still to be elucidated experimentally and much to be done theoretically before all the underlying forces are identified and estimated from a priori calculations. It is hoped that the book will provide a useful stimulus in this direction. It should also be of use to those who are interested in related disciplines, for example the rare earth compounds, or the transition metals. In addition rare earths promise to be important technologically as alloy constituents.
Book Synopsis The Electronic Structure of Rare-earth Metals and Alloys by : B. Coqblin
Download or read book The Electronic Structure of Rare-earth Metals and Alloys written by B. Coqblin and published by . This book was released on 1977 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Magnetic and Electronic Structures of Several Rare Earth-transition Metal Intermetallic Compounds by : Chiu-Ying Tai
Download or read book The Magnetic and Electronic Structures of Several Rare Earth-transition Metal Intermetallic Compounds written by Chiu-Ying Tai and published by . This book was released on 2000 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances In Magnetism Of Transition Metal Compounds: Festschrift In Honour Of Professor K Motizuki by : Akio Kotani
Download or read book Recent Advances In Magnetism Of Transition Metal Compounds: Festschrift In Honour Of Professor K Motizuki written by Akio Kotani and published by World Scientific. This book was released on 1993-03-18 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a Festschrift in honour of Professor Kazuko Motizuki on the occasion of her retirement from Osaka University. She has been active in a variety of branches of solid state physics and, in particular, has made an important contribution to the theory of magnetism. The book reviews recent advances in magnetism of transition metal compounds, both for itinerant electron systems and localized spin systems. For the former systems, band calculational methods, correlation effects, and theoretical aspects of photoemission spectroscopy are reviewed generally, and then recent progress in the theoretical and experimental understanding of magnetic properties of various kinds of intermetallic compounds and intercalation compounds of transition-metal dichalcogenides are reviewed in detail. For the latter systems, attention is focused on quantum effects, frustration and competing interaction in low-dimensional systems. Main subjects treated in the book are Haldane gap-systems, singlet-ground-state systems, triangular spin systems, and quantum spin chains with competing interactions.
Book Synopsis The Magnetic and Electron Structures of Transition Metals and Alloys by : V. G. Veselago
Download or read book The Magnetic and Electron Structures of Transition Metals and Alloys written by V. G. Veselago and published by Nova Publishers. This book was released on 1988 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Magnetic Materials by : Ekkes H. Brück
Download or read book Handbook of Magnetic Materials written by Ekkes H. Brück and published by Elsevier. This book was released on 2020-11-29 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Magnetic Materials, Volume 29, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors on topics such as spin-orbit torque. Provides the authority and expertise of leading contributors from an international board of authors Presents the latest release in the Handbook of Magnetic Materials series
Book Synopsis Transition Metal and Rare Earth Compounds by : Hartmut Yersin
Download or read book Transition Metal and Rare Earth Compounds written by Hartmut Yersin and published by Springer. This book was released on 2003-07-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: There exists a large literature on the spectroscopic properties of copper(II) com- 9 pounds. This is due to the simplicity of the d electron configuration, the wide variety of stereochemistries that copper(II) compounds can adopt, and the f- xional geometric behavior that they sometimes exhibit [1]. The electronic and geometric properties of a molecule are inexorably linked and this is especially true with six-coordinate copper(II) compounds which are subject to a Jahn-T- ler effect.However,the spectral-structural correlations that are sometimes d- wn must often be viewed with caution as the information contained in a typical solution UV-Vis absorption spectrum of a copper(II) compound is limited. Meaningful spectral-structural correlations can be obtained in a related series of compounds where detailed spectroscopic data is available. In the fol- 4– lowing sections two such series are examined; the six-coordinate CuF and 6 2+ Cu(H O) ions doped as impurities in single crystal hosts.Using low tempera- 2 6 ture polarized optical spectroscopy and electron paramagnetic resonance, a very detailed picture can be drawn about the geometry of these ions in both their ground and excited electronic states. We then compare the spectrosco- cally determined structural data with that obtained from X-ray diffraction or EXAFS measurements.
