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Title: Calculation of Overdamped C-Axis Charge Dynamics And the Coupling to Polar Phonons in Cuprate Superconductors

Abstract

No abstract prepared.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
897748
Report Number(s):
SLAC-REPRINT-2006-189
TRN: US0701506
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.B74:174524,2006
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CUPRATES; PHONONS; SUPERCONDUCTORS; Other,OTHER

Citation Formats

Meevasana, W., Devereaux, T.P., Nagaosa, N., Shen, Z.X., Zaanen, J., and /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /Waterloo U. /Tokyo U. Calculation of Overdamped C-Axis Charge Dynamics And the Coupling to Polar Phonons in Cuprate Superconductors. United States: N. p., 2007. Web.
Meevasana, W., Devereaux, T.P., Nagaosa, N., Shen, Z.X., Zaanen, J., & /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /Waterloo U. /Tokyo U. Calculation of Overdamped C-Axis Charge Dynamics And the Coupling to Polar Phonons in Cuprate Superconductors. United States.
Meevasana, W., Devereaux, T.P., Nagaosa, N., Shen, Z.X., Zaanen, J., and /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /Waterloo U. /Tokyo U. Tue . "Calculation of Overdamped C-Axis Charge Dynamics And the Coupling to Polar Phonons in Cuprate Superconductors". United States. doi:.
@article{osti_897748,
title = {Calculation of Overdamped C-Axis Charge Dynamics And the Coupling to Polar Phonons in Cuprate Superconductors},
author = {Meevasana, W. and Devereaux, T.P. and Nagaosa, N. and Shen, Z.X. and Zaanen, J. and /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /Waterloo U. /Tokyo U.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Phys.Rev.B74:174524,2006},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 16 00:00:00 EST 2007},
month = {Tue Jan 16 00:00:00 EST 2007}
}
  • We present grazing incidence reflectivity measurements in the far-infrared region at temperatures above and below T{sub c} for a series of thallium- (Tl{sub 2}Ba{sub 2}CuO{sub 6}, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}) and bismuth- (Bi{sub 2}Sr{sub 2}CuO{sub 6}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, and Bi{sub 2{minus}x}Pb{sub x}Sr{sub 2}CaCu{sub 2}O{sub 8}) based cuprate superconductors. From the spectra, which are dominated by the c-axis phonons, longitudinal optical (LO) frequencies are directly obtained. The reflectivity curves are well fitted by a series of Lorentz oscillators. In this way the transverse optical (TO) phonon frequencies were accurately determined. On the basis of the comparative studymore » of the Bi- and Tl-based cuprates with a different number of CuO{sub 2} layers per unit cell, we suggest modifications of the assignment of the main oxygen modes. We compare the LO frequencies in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} obtained from intrinsic Josephson junction characteristics with our measurements, and explain the discrepancy in LO frequencies obtained by the two different methods. {copyright} {ital 1999} {ital The American Physical Society}« less
  • The recently reported subgap structures in the current-voltage characteristic of intrinsic Josephson junctions in the high-T{sub c} superconductors Tl{sub 2}Ba {sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{delta} } and Bi{sub 2}Sr {sub 2}CaCu{sub 2}O{sub 8+{delta}} are explained by the coupling between c -axis phonons and Josephson oscillations. A model is developed where c -axis lattice vibrations between adjacent superconducting multilayers are excited by the Josephson oscillations in a resistive junction. The voltages of the lowest structures correspond well to the frequencies of longitudinal c -axis phonons with large oscillator strength in the two materials, providing a new measurement technique for this quantity.more » {copyright} {ital 1997} {ital The American Physical Society}« less
  • The authors have investigated the anisotropic quasiparticle conductivity in the superconducting state for microwave frequencies in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (YBCO) and La{sub 2{minus}x}Sr{sub x}CuO{sub 4} (LSCO) with several hole concentrations. Common features were found for YBCO and LSCO. That is, in underdoped materials, the strong two dimensional nature was found to be retained even below T{sub c}. On the other hand, in optimally doped and overdoped materials, the anisotropy decreases rapidly below T{sub c}. In particular, in YBCO, it is suggested that the c-axis transport becomes coherent below T{sub c}.
  • The mechanism for the high-T/sub c/ superconductivity in the oxide superconductors is theoretically investigated. The interplay of the Cu-O electron transfer and the Coulomb interaction acting on electrons produces large charge fluctuations with low frequencies in the oxides. The LO phonons strongly interact with the charge fluctuations and generate the Cu-O charge-transfer oscillations with frequencies close to the LO phonons. The amplitudes of the oscillations are extremely large. The experimental results of electron-energy-loss spectroscopy and neutron scattering provide evidence to show the large amplitude of the charge oscillations in the oxides. The interaction mediated by the charge oscillations yields amore » strong attractive force acting between electrons. We suggest that the attractive force is responsible for the high-T/sub c/ superconductivity in the oxides.« less