Electronic Excitations in Strongly Correlated Electron Systems Measured with Resonant Inelastic X-ray Scattering PDF Download
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Author: Francesca L. Fracassi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Francesca L. Fracassi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Winfried Schuelke
Publisher: OUP Oxford
ISBN: 0191523283
Category : Science
Languages : en
Pages : 608
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Book Description
Knowledge of the dynamics of many-electron systems is of fundamental importance to all disciplines of condensed matter physics. A very effective access to electron dynamics is offered by inelastic X-ray scattering (IXS) spectroscopy. The double differential scattering cross section for IXS is directly related to the time-dependent two-particle density correlation function, and, for large momentum and energy transfer (Compton limit) to the electron momentum distribution. Moreover, resonant inelastic X-ray scattering (RIXS) enables the study of electron dynamics via electronic excitations in a very selective manner (e.g. selectively spin, crystal momentum, or symmetry), so that other methods are efficaciously complemented. The progress of IXS spectroscopy is intimately related to the growing range of applications of synchrotron radiation. The aim of the book is to provide the growing community of researchers with accounts of experimental methods, instrumentation, and data analysis of IXS, with representative examples of successful applications, and with the theoretical framework for interpretations of the measurements.
Author: Winfried Schülke
Publisher: Oxford University Press, USA
ISBN: 0198510179
Category : Science
Languages : en
Pages : 606
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Book Description
This work offers the first comprehensive review of experimental methods, theory, and successful applications of synchrotron radiation based on inelastic X-ray scattering spectroscopy, which enables the investigation of electron dynamics in condensed matter (correlated motion and excitation).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
Inelastic x-ray scattering (IXS) provides high-pressure research with an arsenal of analytical capabilities for key measurements that were previously unattainable, and high pressure research provides IXS with numerous applications where the technique has unique advantages over other methods. High-pressure investigations can now be conducted using non-resonant IXS, resonant IXS, nuclear resonant IXS, and x-ray emission spectroscopy with energy resolutions of 100 meV to 1 eV for electronic transitions and 1 to 10 meV for phonon studies. By pressure-tuning materials over a wide range, we are able to investigate fundamental physics of electron gases, strongly correlated electron systems, high-energy electronic excitations, and phonons in energy and momentum space. The results will have a profound influence on materials applications as well as providing basic information for understanding the deep interior of the Earth and other planets.
Author: Youichi Murakami
Publisher: Springer
ISBN: 3662532271
Category : Science
Languages : en
Pages : 246
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Book Description
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.
Author: David Shai Ellis
Publisher:
ISBN: 9780494677124
Category :
Languages : en
Pages : 354
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Book Description
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.
Author: Eberhard J. Jaeschke
Publisher: Springer
ISBN: 9783319143934
Category : Science
Languages : en
Pages : 0
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Book Description
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.
Author: David Shai Ellis
Publisher:
ISBN: 9780494677124
Category :
Languages : en
Pages : 0
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Book Description
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 & rarr;4p transition were studied over a wide range of dopings 0 & le; x & le; 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 & sim;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.
Author: Teikichi A. Sasaki
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 688
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Book Description
Author: Timothy Learmonth
Publisher:
ISBN: 9780549433453
Category :
Languages : en
Pages : 266
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Book Description
Abstract: The electronic properties of quasi-low dimensional correlated transition metal compounds were investigated using x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), and resonant inelastic x-ray scattering (RIXS). XAS and XES can be used to probe the element specific partial density of electronic states, and XAS and RIXS to probe the band structure and low energy electronic excitations. These spectroscopies are photon based, rather than electron based, which allows for charge neutral measurements. Photon spectroscopies, and RIXS in particular, show promise as complementary spectroscopies to the more common angle-resolved photoemission as probes of correlated materials, and offer a means to investigate previously inaccessible insulators. A selection of quasi-low dimensional correlated systems have been studied for the first time using this combination of spectroscopic techniques. MoO 3 is a quasi-two dimensional insulator in which the effects of reduced dimensionality has not been well explored. X-ray spectroscopy was used to measure the band structure, and revealed the predicted quasi-two dimensionality in the electronic structure. When an alkali metal is incorporated, MoO 3 can be altered into a range of quasi-low dimensional materials, one of which being the prototypical quasi-one dimensional conductor K 0.3 MoO 3 . Spectroscopic results from K 0.3 MoO 3 are compared to calculated predictions of the electronic structure and results from MoO 3 . Strong similarities are observed, despite their vastly different bulk properties. From another large class of strongly correlated quasi-low dimensional materials, Li 2 CuO 2 is a quasi-one dimensional insulator with crystallographic building blocks in common with high transition temperature superconductors. Polarization dependent RIXS measurements of Li 2 CuO 2 show the presence of a novel two-hole electronic excitation which is interpreted in light of the Cu-Cu magnetic coupling. Lastly, BaVS 3 is a quasi-one dimensional correlated metal with a metal-to-insulator transition (MIT) that involves many competing interactions. RIXS as a function of sample temperature of Ti substituted BaTi 0.02 V 0.98 S 3 was measured, and evidence of a localizing electronic transition with similar temperature dependence as the MIT in BaVS 3 was detected. This is evidence that the Ti sites do not mix electronically with the V sites strongly enough to upset the balance of competing interactions that lead to the MIT in BaVS 3.
