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Inelastic And Small Angle Neutron Scattering Study Of The La2 Xsrxcuo4 High C Superconductor In A Magnetic Field
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Book Synopsis Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-[Tau]c Superconductor in a Magnetic Field by : Raffaele Gilardi
Download or read book Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-[Tau]c Superconductor in a Magnetic Field written by Raffaele Gilardi and published by . This book was released on 2004 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-Τc Superconductor in a Magnetic Field by : Raffaele Gilardi
Download or read book Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-Τc Superconductor in a Magnetic Field written by Raffaele Gilardi and published by . This book was released on 2004 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-Tc Superconductor in a Magnetic Field by : Raffaele Gilardi
Download or read book Inelastic and Small Angle Neutron Scattering Study of the La2-xSrxCuO4 High-Tc Superconductor in a Magnetic Field written by Raffaele Gilardi and published by . This book was released on 2004 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Studies of Spin-phonon Hybridization and Superconducting Spin Gaps in the High Temperature Superconductor La2-x(Sr;Ba)xCuO4 by :
Download or read book Neutron Scattering Studies of Spin-phonon Hybridization and Superconducting Spin Gaps in the High Temperature Superconductor La2-x(Sr;Ba)xCuO4 written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present time-of-flight neutron-scattering measurements on single crystals of La2-xBaxCuO4 (LBCO) with 0 ≤ x ≤ 0.095 and La2-xSrxCuO4 (LSCO) with x = 0.08 and 0.11. This range of dopings spans much of the phase diagram relevant to high temperature cuprate superconductivity, ranging from insulating, three dimensional commensurate long range antiferromagnetic order for x ≤ 0.02 to two dimensional (2D) incommensurate antiferromagnetism co-existing with superconductivity for x ≥ 0.05. Previous work on lightly doped LBCO with x = 0.035 showed a clear resonant enhancement of the inelastic scattering coincident with the low energy crossings of the highly dispersive spin excitations and quasi-2D optic phonons. The present work extends these measurements across the phase diagram and shows this enhancement to be a common feature to this family of layered quantum magnets. Furthermore we show that the low temperature, low energy magnetic spectral weight is substantially larger for samples with non-superconducting ground states relative to any of the samples with superconducting ground states. Lastly spin gaps, suppression of low energy magnetic spectral weight, are observed in both superconducting LBCO and LSCO samples, consistent with previous observations for superconducting LSCO.
Book Synopsis Neutron Scattering Studies on Magnetism and Phonon in the Electron-doped Nd2[subscript X]Ce[subscript X]CuO4 and Pr1[subscript X]LaCe[subscript X]CuO4 by :
Download or read book Neutron Scattering Studies on Magnetism and Phonon in the Electron-doped Nd2[subscript X]Ce[subscript X]CuO4 and Pr1[subscript X]LaCe[subscript X]CuO4 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present comprehensive neutron scattering studies on the electron-doped superconductors Nd2[subscript x]Ce[subscript x]CuO4 and Pr1[subscript x]LaCe[subscript x]CuO4 to understand how magnetic properties and phonon are related to superconductivity. For superconducting Nd1[subscript point]5Ce0[subscript point]15CuO4, a[italicized c]-axis magnetic field enhances the commensurate antiferromagnetic order, while an [italicized ab]-plane magnetic field induces spin-flop transition from a noncollinear to a collinear magnetic structure. The [italicized c]-axis field-induced effect is absent in both parent Nd2CuO4 and the as-grown nonsuperconducting Nd1[subscript point]5Ce0[subscript point]15CuO4 samples. These results, combined with those on the hole-doped La2−[subscript x]Sr[subscript x]CuO4 suggest that the antiferromagnetism competes with supercondictivity. In the Pr1−[subscript x]LaCe[subscript x]CuO4 system, we find that quasi-2 dimensional commensurate antiferromagnetism coexists with superconductivity and 3 dimensional antiferromagnetism. To determine whether the antiferromagnetic order is the competing order in the high temperature superconductors, regardless of hole-doping or electron-doping, we performed field-induced experiments on the electron-doped superconductor Pr0[subscript point]88LaCe0[subscript point]12CuO4[subscript plus or minus delta] by applying magnetic fields along the [italicized c]-direction and in the [italicized ab]-plane direction. The anisotropy of the field-induced moment demonstrates the competing nature of these two order parameters. We find that the spin-flop transition induced by an [italicized ab]-plane magnetic field in the lightly electron-doped Pr1[subscript point]29La0[subscript point]--Ce0[subscript point]01CuO4 affects significantly both in-plane and out-of-plane resistivity. No magnetoresistance anomaly is observed when a [italicized c]-axis magnetic field is applied, consistent with the absence of a spin-flop transition for such field direction. This anisotropic magnetoresistance effect suggests that there is spin-charge coupling in the electron-doped superconductors as well as in the hole-doped ones. Inelastic neutron scattering has been performed to study the generalized phonon density of states (GDOS) of electron-doped Nd2−[subscript x]Ce[subscript x]CuO4 with various levels of doping. Upon doping, the softening of phonon around 70 me V has been observed. However, most of the softening occurs within a few percent of Ce doping, and it is not related to the doping induced nonsuperconducting-superconducting transition. Therefore, the electron-lattice coupling in the electron-doped Nd2−[subscript x]Ce[subscript x]CuO4 is different from that in the hole-doped materials.
Book Synopsis Neutron Scattering Study of High Tc Superconductors by : Jun Zhao
Download or read book Neutron Scattering Study of High Tc Superconductors written by Jun Zhao and published by . This book was released on 2010 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: We carried out systematic neutron scattering experiments to investigate the magnetic properties and their relationship to the high-Tc superconductivity, when the materials are tuned from their antiferromagnetic (AF) parent compounds to the superconducting regime. We observed resonance mode in the electron doped cuprate Nd[subscript 1.85]Ce[subscript 0.15]CuO[subscript 4], demonstrating that the resonance is a general phenomenon in cuprate superconductors regardless of hole- or electron-doping. In Pr[subscript 0.88]LaCe[subscript 0.12]CuO[subscript 4], the local susceptibility displays two distinct energy scales that are broadly consistent with the bosonic modes revealed by scanning tunneling microscopy experiments. These results indicate the presence of very strong electron spin excitations couplings in electron doped cuprates. Shortly after the discovery of high-Tc superconductivity in the Fe pnictides, we discovered that the magnetic phase diagram of CeFeAsO[subscript 1-x]F[subscript x] is remarkably similar to that of the cuprates. Besides CeFeAsO, similar magnetic and lattice structures are also observed in PrFeAsO and SrFe[subscript 2]As[subscript 2] systems. Neutron scattering measurements show that in SrFe[subscript 2]As[subscript 2], the spectrum of magnetic excitations consists of a Bragg peak at the elastic position, a spin gap, and sharp spin-wave excitations at higher energies. Based on the observed dispersion relation, we estimated the effective magnetic exchange coupling using a Heisenberg model. In order to study the nature of the exchange interactions in the parent compound of Fe pnictides, we studied the high energy spin-wave excitations in CaFe2As2. Although the spin waves in the entire Brillouin zone can be described by an effective three-dimensional anisotropic Heisenberg Hamiltonian, the magnetism in this system is neither purely local nor purely itinerant; rather it is a complicated mix of the two. When the Fe pnictide is tuned into superconducting regime with doping, the low energy spin fluctuation is dominated by a resonance mode. In the optimally electron doped BaFe[subscript 1.9]Ni[subscript 0.1]As[subscript 2], application of a magnetic field that suppresses the superconductivity and superconducting gap energy also reduces the intensity and energy of the resonance. These results suggest that the energy of the resonance is proportional to the electron pairing energy, and thus indicate that spin fluctuations are intimately related to the mechanism of high Tc superconductivity.
Book Synopsis Inelastic Neutron Scattering from Type-II Superconductors by : Richard A. Sacks
Download or read book Inelastic Neutron Scattering from Type-II Superconductors written by Richard A. Sacks and published by . This book was released on 1974 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Study of Magnetic Excitations in Two High-temperature Superconductors by : Guichuan Yu
Download or read book Neutron Scattering Study of Magnetic Excitations in Two High-temperature Superconductors written by Guichuan Yu and published by . This book was released on 2008 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Studies of the Coexistence of Long-range Magnetic Order and Superconductivity in Dy/sub 1 /sub 2/Mo/sub 6/S/sub 8/ and Tb/sub 1 /sub 2/Mo/sub 6/S/sub 8 by :
Download or read book Neutron Scattering Studies of the Coexistence of Long-range Magnetic Order and Superconductivity in Dy/sub 1 /sub 2/Mo/sub 6/S/sub 8/ and Tb/sub 1 /sub 2/Mo/sub 6/S/sub 8 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Both Dy/sub 1/ /sub 2/Mo/sub 6/S/sub 8/ and Tb/sub 1/ /sub 2/Mo/sub 6/S/sub 8/ are superconducting below T/sub c/ = 2.05 K. Neutron scattering studies show that these compounds in zero applied magnetic field develop long-range antiferromagnetic order (greater than 300 A) at T/sub M/ = 0.4 K and T/sub M/ = 1.0 K, respectively, which does not destroy the superconducting state. Magnetization measurements at temperatures below T/sub M/ suggest the development of ferromagnetic order as the applied magnetic field increases. In the case of Tb/sub 1/ /sub 2/Mo/sub 6/S/sub 8/ the neutron data show long-range ferromagnetic order developing for H greater than or equal to H/sub c2/ = 1.9 kOe where H/sub c2/ is the upper critical field for superconductivity. However, for Dy/sub 1/ /sub 2/Mo/sub 6/S/sub 8/ long-range ferromagnetic order begins to develop at H = 200 Oe, a field much less than H/sub c2/ = 1.2 kOe. As the ferromagnetic intensity increases, the antiferromagnetic intensity decreases. Between H = 200 Oe and H = 1.2 kOe both ferromagnetic and antiferromagnetic order occur with the sample in the superconducting state.
Book Synopsis Quantum Materials Explored by Neutron Scattering by : Peter Babkevich
Download or read book Quantum Materials Explored by Neutron Scattering written by Peter Babkevich and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes neutron scattering experiments on strongly correlated systems exhibiting a range of emergent phenomena: antiferromagnetism, charge order, superconductivity and multiferroicity. I have examined the La_{2}CoO_{4} compound which is a Mott insulator and orders antiferromagnetically near room temperature. The La_{2}CoO_{4} sample was studied using spherical neutron polarimetry and I present magnetic structure models to describe the two antiferromagnetic phases of the compound. Furthermore, the magnetic fluctuations have been investigated using neutron time-of-flight technique. This has allowed us to extract the dominant exchange interactions in the system. More interestingly, the work on La_{2}CoO_{4} presented in this thesis provides a basis for the experimental evidence of an hourglass dispersion in La_{5/3}Sr_{1/3}CoO_{4}, previously only observed in the copper oxide based superconductors. This dispersion has been understood in terms of a stripe ordered magnetic phase and was found to be well described by a linear spin-wave model. Neutron scattering experiments were also carried out on the new iron-based high-temperature superconductors, FeSe_{x}Te_{1-x}. A range of compositions were studied, including both antiferromagnetically ordered and superconducting. Below the superconducting phase transition temperature, a spin resonance mode was found centred on the antiferromagnetic wavevector. This is an important feature shared by many unconventional superconductors. The spin resonance intensity was found to reflect the order parameter of the superconducting state. Polarised inelastic neutron scattering experiments have revealed a small anisotropy between the in-plane and out-of-plane magnetic fluctuations at the resonance. This anisotropy cannot be readily explained by the usual anisotropic terms in the Hamiltonian. This could be evidence of new physics in the FeSe_{x}Te_{1-x} superconductors. Finally, I have studied CuO - a high-temperature multiferroic. Analysis of polarised neutron diffraction experiments shows that the magnetic domain population can be varied using an externally applied electric field. This unambiguously demonstrates coupling between the magnetic and ferroelectric degrees of freedom. Using representation analysis I derive the incommensurate magnetic structure in the multiferroic phase. The origin of the magnetoelectric coupling is consistent with models based on the inverse Dzyaloshinskii-Moriya interaction.
Book Synopsis Some neutron scattering studies on magnetic and molecular phase... by : Leendert Bevaart
Download or read book Some neutron scattering studies on magnetic and molecular phase... written by Leendert Bevaart and published by . This book was released on 19?? with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Muon Spin Rotation and Small Angle Neutron Scattering Studies of the Mixed State in High Temperature Superconductors by : Robert Cubitt
Download or read book Muon Spin Rotation and Small Angle Neutron Scattering Studies of the Mixed State in High Temperature Superconductors written by Robert Cubitt and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Small Angle Neutron Scattering Studies of the Flux Line Lattices in the Borocarbide Superconductors by : Morten Ring Eskildsen
Download or read book Small Angle Neutron Scattering Studies of the Flux Line Lattices in the Borocarbide Superconductors written by Morten Ring Eskildsen and published by . This book was released on 1998 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Strongly Correlated Electron Systems Using Neutron Scattering by : Yuen Yiu
Download or read book Studies of Strongly Correlated Electron Systems Using Neutron Scattering written by Yuen Yiu and published by . This book was released on 2015 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world presents many natural and man-made crises and challenges that require scientific solutions. Condensed matter physics is one of the most influential and solution oriented disciplines in science. The field saw a significant rise in popularity especially during the past century as mankind enters the Information Age, when energy and computing related technologies become ubiquitous. This technological progress has been driven by efforts from scientists and engineers, through the synthesis, understanding, and implementation of new materials. Condensed matter physicists strive to solve puzzles at the frontier of material research. In the 21st century we have many advance tools at our disposal to help evaluate and solve these puzzles. For this thesis we focus on the forefront techniques of neutron scattering, along with other experimental methods to explore three frontier problems in condensed matter physics. The first problem is the investigation of phase transitions in Ru/Fe [Ruthenium/Iron] substituted PrFeAsO [Praseodymium Iron Arsenic Oxide]. PrFeAsO belongs to the 1111 family of iron pnictides, in which superconductivity can usually be induced by suppressing the magnetic and structural transitions via carrier doping. We have used neutron powder diffraction to investigate the effect of isoelectronic substitution on these transitions in PrFeAsO. Second is the study of the helimagnetic ordering in Cr [Chromium] doped FeGe [Iron Germanide]. Both CrGe [Chromium Germanide] and FeGe are in the B20 cubic structure, where CrGe exhibits no long range magnetic order down to at least 2 K, FeGe orders helimagnetically at 280 K with a periodicity of 700 Angstroms. We use small angle neutron scattering to study the Cr doping dependence of helimagnetism in FeGe. Finally, we examine the lattice dynamics in rocksalt structure compounds UC [Uranium Carbide] and US [Uranium Sulfide]. A recent inelastic neutron scattering experiment revealed quantum harmonic oscillator behavior of N [Nitrogen] atoms in UN [Uranium Nitride]. We deduce that other uranium rocksalts should also exhibit such behaviors. We use inelastic neutron scattering to extend the study on quantum harmonic oscillations in uranium rock salts.
Author :Chris Stock Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494028919 Total Pages :366 pages Book Rating :4.0/5 (289 download)
Book Synopsis Neutron Scattering Studies of Superconducting YBa↓2Cu↓2O↓6↓+↓x and Relaxor Ferroelectrics Pb(Mg↓1↓ by : Chris Stock
Download or read book Neutron Scattering Studies of Superconducting YBa↓2Cu↓2O↓6↓+↓x and Relaxor Ferroelectrics Pb(Mg↓1↓ written by Chris Stock and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lattice dynamics and structural properties were measured in the ferroelectrics Pb(Mg1/3Nb2/3)O3 and Pb(Zn1/3Nb 2/3)O3. Relaxor ferroelectrics have attracted much attention recently due to their exceptional piezoelectric properties. Despite the previous belief that these two materials are very different, the lattice dynamics are found to be nearly identical. The main difference between the two materials is the presence of a large near-surface region in Pb(Zn1/3Nb 2/3)O3 which undergoes a well defined structural transition. The relaxor transition can be interpreted in terms of a random field model where the appropriate universality class is the three-dimensional Heisenberg model with cubic anisotropy. The random field model can be further applied to reconcile previous apparent conflicting interpretations of the lattice dynamics.Neutron scattering is an important tool in studying the structure, lattice vibrations, and spin dynamics in materials. Neutron elastic and inelastic scattering was used in this work to investigate the fluctuations and the structure in the YBa2CuO6+x superconductor as well as the relaxor ferroelectrics Pb(Mg1/3Nb2/3)O 3 and Pb(Zn1/3Nb2/3)O3. The spin fluctuations in the YBa2Cu3O6+x superconductor were studies for x in the underdoped region with x = 0.5 (Tc = 59 K). YBa2Cu 3O6.5 has good structural properties with well ordered oxygen chains. This provides a unique opportunity to study the spin fluctuations in a high-temperature superconductor in the presence of minimal structural disorder. The spin response in the YBa2Cu3O6.5 superconductor has been investigated using both time-of-flight and triple-axis spectrometers up to energy transfers of about 110 meV. The spin spectrum in YBa2Cu3O6.5 is dominated by a strong resonance at 33 meV. The low-energy scattering is characterized by one-dimensional incommensurate scattering with incommensurate peaks displaced along [100] direction. The high-energy fluctuations in the range from ho = 40--100 meV are qualitatively similar to the linear spin-waves measured in the insulator.
Book Synopsis Neutron Scattering - Magnetic and Quantum Phenomena by :
Download or read book Neutron Scattering - Magnetic and Quantum Phenomena written by and published by Elsevier. This book was released on 2015-11-29 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron Scattering - Magnetic and Quantum Phenomena provides detailed coverage of the application of neutron scattering in condensed matter research. The book's primary aim is to enable researchers in a particular area to identify the aspects of their work where neutron scattering techniques might contribute, conceive the important experiments to be done, assess what is required to carry them out, write a successful proposal for one of the major user facilities, and perform the experiments under the guidance of the appropriate instrument scientist. An earlier series edited by Kurt Sköld and David L. Price, and published in the 1980s by Academic Press as three volumes in the series Methods of Experimental Physics, was very successful and remained the standard reference in the field for several years. This present work has similar goals, taking into account the advances in experimental techniques over the past quarter-century, for example, neutron reflectivity and spin-echo spectroscopy, and techniques for probing the dynamics of complex materials of technological relevance. This volume complements Price and Fernandez-Alonso (Eds.), Neutron Scattering - Fundamentals published in November 2013. Covers the application of neutron scattering techniques in the study of quantum and magnetic phenomena, including superconductivity, multiferroics, and nanomagnetism Presents up-to-date reviews of recent results, aimed at enabling the reader to identify new opportunities and plan neutron scattering experiments in their own field Provides a good balance between theory and experimental techniques Provides a complement to Price and Fernandez-Alonso (Eds.), Neutron Scattering - Fundamentals published in November 2013
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