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11.
The reflectivity of KCl has been measured up to 45 eV with synchrotron radiation extending the range of previous measurements. The absorption coefficient is compared with an ab initio calculation using an orthogonalized-plane-wave expansion for the final states of the excited electron and including excitonic and crystalline effects. The distribution of the oscillator strength and its modulations are well reproduced by the theory. 相似文献
12.
A. Kotani T. Jo K. Okada T. Nakano M. Okada A. Bianconi A. Marcelli J.C. Parlebas 《Journal of magnetism and magnetic materials》1987,70(1-3):28-32
X-ray photoemission, X-ray photoabsorption and bremmstrahlung isochromat spectroscopy in Ce and La compounds are theoretically analyzed by using the single-site Anderson model incorporated with various final state interactions. Discussions are given on the physical information derived from the analysis and also on similarities and differences in spectral features between metallic and insulating systems. 相似文献
13.
G. Campi E. Cappelluti Th. Proffen X. Qiu E. S. Bozin S. J.L. Billinge S. Agrestini N. L. Saini A. Bianconi 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,52(1):15-21
We have studied temperature evolution of the local as well as the
average crystal structure of MgB2 using real-space atomic pair
distribution function (PDF) measured by high resolution neutron powder
diffraction in a wide temperature range of T=10–600 K. We find small
positive correlation factors for the B–B and B–Mg pairs, determined by
mean-square displacements (MSD) and the mean-square relative
displacements (MSRD). We analyze the PDF using both Einstein and
force constant models finding a good agreement between the
experimental data and the two models. This indicates that B and Mg
atomic correlations are not sensitive to the details of phonon
dispersion. 相似文献
14.
Il Nuovo Cimento D - The temperature dependence of local Cu site conformations in single-domain crystals of Bi2Sr2CaCu2O8+y (Bi-2212) and La1.85Sr0.15CuO4 (La-214) has been determined by EXAFS... 相似文献
15.
The metal-to-insulator transition (MIT) in V2O3 has been studied by thermoreflectance spectroscopy. The behaviour of the plasmon resonance as a function of crystal temperature has been measured. This experimental method is a sensitive probe of the effects of electron-electron correlation and/or of the band gap opening at the MIT phase transitions. A blue shift of the plasmon energy in cooling the sample throught the phase transition temperature has been found. This behaviour, with a shift in the opposite direction of that found in VO2, provides a direct experimental evidence that the electron-electron interaction plays a minor role in driving the V2O3 phase transition. 相似文献
16.
17.
Barbara Bianconi Matteo Focardi Elvira Mascolo 《Annali di Matematica Pura ed Applicata》2002,180(4):493-510
We study the lower semicontinuity properties of non-autonomous variational integrals whose energy densities satisfy general
growth conditions. We apply these results to solve Dirichlet’s boundary value problems for such functionals.
Received: June 14, 2000; in final form: November 25, 2000 Published online: December 19, 2001 相似文献
18.
The Kurzweil-Henstock integral formalism is applied to establish the existence of solutions to the linear integral equations of Volterra-typewhere the functions are Banach-space valued. Special theorems on existence of solutions concerning the Lebesgu3 integral setting are obtained. These sharpen earlier results. 相似文献
19.
A. Lanzara N.L. Saini M. Brunelli F. Natali A. Bianconi P.G. Radaelli 《Zeitschrift für Physik B Condensed Matter》1997,104(4):699-702
Recent studies have shown that structural instabilities play a vital role in segregation of charge carriers in the perovskites. We have used extended x-ray absorption fine structure (EXAFS) to investigate the instability of the CuO6 octahedra of the La1:85Sr0:15CuO4 (LSCO) system showing high Tc superconductivity and the MnO6 octhahedra of the La0:75Ca0:25MnO3 (LCMO) system showing GMR (giant-magneto resistance) properties. Temperature dependent Cu K-edge EXAFS spectra on the LSCO and Mn K-edge on the LCMO systems are reported. The results show a similarity in the lattice instability of the two systems providing evidence for a similar phase segregation of localized and itinerant charge carriers in the two families of perovskite systems. 相似文献
20.
N.L. Saini J. Avila M.C. Asensio S. Tajima G.D. Gu N. Koshizuka A. Valletta A. Lanzara A. Bianconi 《Zeitschrift für Physik B Condensed Matter》1997,104(4):703-706
A complete Fermi surface in the normal state of superconducting Bi2Sr2CaCu2O8+δ at the optimum doping (T c = 91K) has been measured by angle scanning photoemission spectroscopy using synchrotron radiation. The Fermi surface reveals broken segments and hot spots of high photointensity along lines of k y = n:0:23Å?1 in the (π; π) direction. The pseudogap observed at (π,0) in underdoped materials is one of this missing segments. The results indicate the presence of characteristic subbands of a superlattice of quantum stripes. This is formed by an ordered array of ~ 14Å large stripes. 相似文献