Comparative study of the phonons in nonsuperconducting BaC6 and superconducting CaC6 using inelastic x-ray scattering
نویسندگان
چکیده
A. C. Walters,1,2,* C. A. Howard,2 M. H. Upton,3,4 M. P. M. Dean,4 A. Alatas,3 B. M. Leu,3 M. Ellerby,2 D. F. McMorrow,2 J. P. Hill,4 M. Calandra,5 and F. Mauri5 1ESRF, Polygone Scientifique Louis Néel, 6 rue Jules Horowitz, F-38000 Grenoble, France 2London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA 4Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA 5Université Pierre et Marie Curie, 4 Place Jussieu-case postale 115, F-72252 Paris Cedex 05, France (Received 3 February 2011; revised manuscript received 31 March 2011; published 25 July 2011)
منابع مشابه
برهمکنش الکترون - فونون در ابررساناهای دمای بالا
We explore the important role of the strong electron-phonon interaction in high temperature superconductivity through the study of the results of some important experiments, such as inelastic neutron and X-ray scattering, angle resolved photoemission spectroscopy, and isotope effects. We also present our computational results of the eigenvalues and eigenvectors of the Ag Raman modes, and the ...
متن کاملنرم شدگی فونونهای انرژی بالا با گذار عایق - ابررسانا در سیستم ابررسانای Ba1-xKxBiO3
Single crystals of Ba1-xKxBiO3 compound for 0 < x <0.6 from insulator to superconducting region have been grown by electrochemical method. The crystals have been characterized by powder x-ray diffraction and Laue x-ray to determine the crystal structure, formed phases and potassium concentration. Inelastic x-ray scattering spectrum of the crystals has been studied to investigate the phonon pro...
متن کاملRaman scattering from the CaC6 superconductor in the presence of disorder
Polarized Raman scattering has been performed on CaC6 superconductor. We identify two of the three Raman-active Eg phonon modes at 440 and 1508 cm −1 expected for the R3̄m space group of CaC6. These first-order scattering modes appear along with the D and G bands around 1300 and 1600 cm−1 that are similar in origin to the corresponding bands in plain graphite. The intensities of the D and G band...
متن کاملAnisotropic electron-phonon coupling and dynamical nesting on the graphene sheets in superconducting CaC6 using angle-resolved photoemission spectroscopy.
We present the first angle-resolved photoemission studies of electronic structure in CaC6, a superconducting graphite intercalation compound with T_{c}=11.6 K. We find that, contrary to theoretical models, the electron-phonon coupling on the graphene-derived Fermi sheets with high-frequency graphene-derived phonons is surprisingly strong and anisotropic. The shape of the Fermi surface is found ...
متن کاملAnomalous electronic Raman scattering in NaxCoO2.yH2O.
Raman scattering experiments on NaxCoO2.yH2O single crystals show a broad electronic continuum with a pronounced peak around 100 cm(-1) and a cutoff at approximately 560 cm(-1) over a wide range of doping levels. The electronic Raman spectra in superconducting and nonsuperconducting samples are similar at room temperature, but evolve in markedly different ways with decreasing temperature. For s...
متن کامل