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Low Energy Excitations In Some Complex Oxides By Resonant Inelastic X Ray Scattering
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Book Synopsis Low-energy Excitations in Some Complex Oxides by Resonant Inelastic X-ray Scattering by : Jiatai Feng
Download or read book Low-energy Excitations in Some Complex Oxides by Resonant Inelastic X-ray Scattering written by Jiatai Feng and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intriguing physical properties presented in some complex oxides of transition metals draw attention not only in fundamental research but also in applications, for instance, superconductivity, colossal magnetoresistance, multiferroicity. The strong electronic correlation is at the origin of these behaviours. The thesis is a contribution to both the experimental effort to determine the electronic structure of strongly correlated systems and the critical assesment of the theoretical models describing them. Experimentally, the work of is devoted to the investigations of the low-energy excitations (d-d excitations, charge transfer, ...) of the ground state by resonant inelastic x-ray scattering. The experiments have been performed on the SEXTANTS beamline of SOLEIL synchrotron (France) using the high resolving power AERHA spectrometer. The analysis of the data has been focused on the determination of the the crystal field of the transition metal involved using the crystal field multiplets theory.Two systems have been investigated: the multiferroics RMnO3 (R = Tb, Dy) and the ferromagnetic Mott insulator Lu2V2O7.
Book Synopsis Resonant Inelastic X-ray Scattering Study of Two Lamellar Copper Oxides by : Li Lu
Download or read book Resonant Inelastic X-ray Scattering Study of Two Lamellar Copper Oxides written by Li Lu and published by . This book was released on 2006 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RESONANT INELASTIC X-RAY SCATTERING FROM TRANSITION METAL OXIDES. by :
Download or read book RESONANT INELASTIC X-RAY SCATTERING FROM TRANSITION METAL OXIDES. written by and published by . This book was released on 1999 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in hard x-ray resonant inelastic x-ray scattering as a probe of strongly correlated systems are reviewed. Particular attention is paid to studies of Nd2CuO4. A charge transfer excitation is observed when the incident photon energy is tuned in the vicinity of the copper K-edge. It is shown that the presence of resonant enhancements is controlled by the polarization dependence of the excitation process and by the overlap between a given intermediate state and the particular excitation being studied. This latter observation has shed light on the non-local effects present in certain intermediate states.
Book Synopsis Resonant X-Ray Scattering in Correlated Systems by : Youichi Murakami
Download or read book Resonant X-Ray Scattering in Correlated Systems written by Youichi Murakami and published by Springer. This book was released on 2016-12-27 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research and its outcomes presented here is devoted to the use of x-ray scattering to study correlated electron systems and magnetism. Different x-ray based methods are provided to analyze three dimensional electron systems and the structure of transition-metal oxides. Finally the observation of multipole orderings with x-ray diffraction is shown.
Book Synopsis Spectroscopy of Complex Oxide Interfaces by : Claudia Cancellieri
Download or read book Spectroscopy of Complex Oxide Interfaces written by Claudia Cancellieri and published by Springer. This book was released on 2018-04-09 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Book Synopsis Resonant Inelastic X-ray Scattering from Strongly Correlated Copper Oxides by : J. P. Hill
Download or read book Resonant Inelastic X-ray Scattering from Strongly Correlated Copper Oxides written by J. P. Hill and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RESONANT AND NON-RESONANT INELASTIC X-RAY SCATTERING IN CuGeO3 by :
Download or read book RESONANT AND NON-RESONANT INELASTIC X-RAY SCATTERING IN CuGeO3 written by and published by . This book was released on 1999 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxides are presently the focus of much attention in condensed matter physics because of the diverse phenomena exhibited by these materials. Examples include antiferromagnetism, superconductivity and colossal magnetoresistance. The origin of these phenomena lies in the strong electron correlations present in these materials which place them between the well understood limits of band insulators and simple metals. The presence of these correlations makes these materials hard to handle theoretically, and there is a need for more detailed experimental work, in particular in regard to the electronic structure and excitations.
Book Synopsis Resonant Inelastic X-ray Scattering Studies of Elementary Excitations by : Lucas Johannes Peter Ament
Download or read book Resonant Inelastic X-ray Scattering Studies of Elementary Excitations written by Lucas Johannes Peter Ament and published by . This book was released on 2010 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lattice, Spin and Orbital Excitations in Selected Transition Metal Oxides by : Sara Fatale
Download or read book Lattice, Spin and Orbital Excitations in Selected Transition Metal Oxides written by Sara Fatale and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'autrice: RIXS ; transition metal oxides ; strong correlation ; ferroelectricity ; BaTiO3 ; electron-phonon coupling ; high-Tc superconductivity ; cuprates ; La(2-x)SrxCuO4 ; Ba2Cu3O4Cl2.
Book Synopsis A Non-resonant Inelastic X-ray Scattering Study on Silicon Oxides and Clathrates by : Henning Sternemann
Download or read book A Non-resonant Inelastic X-ray Scattering Study on Silicon Oxides and Clathrates written by Henning Sternemann and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inelastic Scattering of X-Rays with Very High Energy Resolution by : Eberhard Burkel
Download or read book Inelastic Scattering of X-Rays with Very High Energy Resolution written by Eberhard Burkel and published by Springer. This book was released on 2013-10-03 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inelastic scattering of X-rays with very high energy resolution has finally become possible thanks to a new generation of high-intensity X-ray sources. This development marks the end to the traditional belief that low energy excitations like lattice vibrations cannot be resolved directly with X-rays: Inelastic scattering experiments allow to observe directly the small energy shifts of the photons. Studies of lattice vibrations, of excitations in molecular crystals, of collective excitations in liquids and electronic excitations in crystals demonstrating the broad applicability and power of this new technology are discussed in this book. The progress in this field opens up fantastic new research areas not only in physics but also in other disciplines such as materials science,biology and chemistry.
Book Synopsis Energy and Polarization Dependence of Resonant Inelastic X-ray Scattering in Nd2CuO4 by : J. P. Hill
Download or read book Energy and Polarization Dependence of Resonant Inelastic X-ray Scattering in Nd2CuO4 written by J. P. Hill and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Approach to Resonant Inelastic X-ray Scattering in Iron-based Superconductors at the Energy Scale of the Superconducting Gap by :
Download or read book Theoretical Approach to Resonant Inelastic X-ray Scattering in Iron-based Superconductors at the Energy Scale of the Superconducting Gap written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, we develop a phenomenological theory to predict the characteristic features of the momentumdependent scattering amplitude in resonant inelastic x-ray scattering (RIXS) at the energy scale of the superconducting gap in iron-based super-conductors. Taking into account all relevant orbital states as well as their specific content along the Fermi surface we evaluate the charge and spin dynamical structure factors for the compounds LaOFeAs and LiFeAs, based on tight-binding models which are fully consistent with recent angle-resolved photoemission spectroscopy (ARPES) data. We find a characteristic intensity redistribution between charge and spin dynamical structure factors which discriminates between sign-reversing and sign-preserving quasiparticle excitations. Consequently, our results show that RIXS spectra can distinguish between s± and s++ wave gap functions in the singlet pairing case. In addition, we find that an analogous intensity redistribution at small momenta can reveal the presence of a chiral p-wave triplet pairing.
Book Synopsis Electronic Excitations in Lanthanum Cuprates Measured by Resonant Inelastic X-ray Scattering by : David Shai Ellis
Download or read book Electronic Excitations in Lanthanum Cuprates Measured by Resonant Inelastic X-ray Scattering written by David Shai Ellis and published by . This book was released on 2010 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excitations of the valence electrons in the high-temperature superconducting cuprate La2--xSr xCuO4 were measured by Resonant Inelastic X-ray Scattering (RIXS). Several types of electronic excitations resonant at the Cu 1s→4p transition were studied over a wide range of dopings 0 ≤ x ≤ 0.35.A 500 meV excitation was observed at a reduced momentum transfer q=(pi 0) corresponding to the zone boundary, whose temperature and doping dependence was the same as the two-magnon Raman scattering mode. The momentum dependence of this 2-magnon excitation agrees with recent theoretical calculations.Momentum resolved measurements of the x=0 sample revealed a broad range of excitations above and below the main charge transfer peak, and their dispersions were measured across the Brillouin zone. These include a dispersionless ∼1.8 eV peak, which is either a local crystal field ( d-d excitation) or dipole-forbidden charge transfer excitation, and a dispersive 2.2 eV peak identified as a Zhang-Ng type charge-transfer exciton. The 2.2 eV peak was less dispersive than predicted from the theoretical models, due to electron-phonon coupling, as illustrated by the temperature dependent shift in the peak position.With increased hole doping, the RIXS spectral weight transfers from higher to lower energies, analogous to earlier optical conductivity studies. At the finite momentum of q=(pi 0), however, the changes are most systematic: an isosbestic point was observed at 2.2 eV where the spectra of all dopings cross, and spectral weight is transferred from high to low energies, with near-linear dependence on x, in a manner suggesting that the integrated RIXS intensity is preserved. The intensity and energy variations of the spectral peaks, as well as the isosbestic point and possible sum rule, could be explained qualitatively by a rigid three-band model which includes the non-bonding oxygen, upper Hubbard, and Zhang-Rice singlet bands. The estimated properties of the bands, such as width and energy separation, are in reasonably quantitative agreement with current theoretical models and angle-resolved photoemission measurements. Moreover, anomalies in the doping dependence are similar to those observed in other types of spectroscopies. These results underscore the relevance of the RIXS method in understanding the electronic behavior of the Lanthanum cuprates.
Book Synopsis Phononic and Electronic Excitations in Complex Oxides Studied with Advanced Infrared and Raman Spectroscopy Techniques by : Fryderyk Lyzwa
Download or read book Phononic and Electronic Excitations in Complex Oxides Studied with Advanced Infrared and Raman Spectroscopy Techniques written by Fryderyk Lyzwa and published by Springer Nature. This book was released on 2022-10-05 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD thesis reports on investigations of several oxide-based materials using advanced infrared and Raman spectroscopy techniques and in combination with external stimuli such as high magnetic or electric field, sptial confinement in thin film heterostructures and the radiation with UV light. This leads to new results in the fields of superconductivity, electronic polarization states and nanoscale phenomena. Among these, the observation of anomalous polar moments is of great relevance for understanding the electric-field-induced metal-to-insulator transistion; and the demonstration that confocal Raman spectroscopy of backfolded acoustic photons in metal-oxide multilayers can be used as a powerful characterization tool for monitoring their interface properties and layer thickness is an important technical development for the engineering of such functional oxide heterostructures.
Book Synopsis Charge Dynamics in Low Dimensional Prototype Correlated Systems by :
Download or read book Charge Dynamics in Low Dimensional Prototype Correlated Systems written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronic structure of Mott systems continues to be an unsolved problem in physics despite more than half-century of intense research efforts. Well-developed momentum-resolved spectroscopies such as photoemission and neutron scattering cannot directly address problems associated with the full Mott gap as angle-resolved photoemission probes the occupied states and neutrons do not couple to the electron's charge directly. Our observation of dispersive particle- hole pair excitations across the charge gap (effective Mott gap) in several low dimensional prototype Mott insulators using high resolution resonant inelastic x-ray scattering suggests that the excitations across the gap are highly anisotropic and momentum dependent. The results indirectly provide some information about the momentum dependence of unoccupied states in these correlated systems. The x-ray scattering results are complementary to the electron scattering results by the possibility of studying the excitations in the high momentum transfer regimes (near the zone boundaries and comers). This is also demonstrated in case of studying plasmons near the wave vector regime where Landau damping starts to dominate. X-ray scattering also allows one to probe the symmetry characters of localized electrons and the excitations through the strong polarization dependence of scattering near a core resonance. The study of charge-orbital localization is demonstrated in case of manganese oxides. Given its deeply bulk-sensitive and weak-coupling nature and the ability to probe dispersive behavior of charge fluctuations over several Brillouin zones, inelastic x-ray scattering shows the promise to become an important experimental tool to study the electronic structure of complex quantum systems.
Book Synopsis Synchrotron Light Sources and Free-Electron Lasers by : Eberhard J. Jaeschke
Download or read book Synchrotron Light Sources and Free-Electron Lasers written by Eberhard J. Jaeschke and published by Springer. This book was released on 2016-05-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardly any other discovery of the nineteenth century did have such an impact on science and technology as Wilhelm Conrad Röntgen’s seminal find of the X-rays. X-ray tubes soon made their way as excellent instruments for numerous applications in medicine, biology, materials science and testing, chemistry and public security. Developing new radiation sources with higher brilliance and much extended spectral range resulted in stunning developments like the electron synchrotron and electron storage ring and the freeelectron laser. This handbook highlights these developments in fifty chapters. The reader is given not only an inside view of exciting science areas but also of design concepts for the most advanced light sources. The theory of synchrotron radiation and of the freeelectron laser, design examples and the technology basis are presented. The handbook presents advanced concepts like seeding and harmonic generation, the booming field of Terahertz radiation sources and upcoming brilliant light sources driven by laser-plasma accelerators. The applications of the most advanced light sources and the advent of nanobeams and fully coherent x-rays allow experiments from which scientists in the past could not even dream. Examples are the diffraction with nanometer resolution, imaging with a full 3D reconstruction of the object from a diffraction pattern, measuring the disorder in liquids with high spatial and temporal resolution. The 20th century was dedicated to the development and improvement of synchrotron light sources with an ever ongoing increase of brilliance. With ultrahigh brilliance sources, the 21st century will be the century of x-ray lasers and their applications. Thus, we are already close to the dream of condensed matter and biophysics: imaging single (macro)molecules and measuring their dynamics on the femtosecond timescale to produce movies with atomic resolution.
