THEORY FOR THE EFFECTS OF IMPURITIES ON THE RAMAN-SPECTRA OF SUPERCONDUCTORS

被引:41
作者
DEVEREAUX, TP
机构
[1] Max-Planck-Institut F̈r Festkörperforschung, D-7000 Stuttgart 80
来源
PHYSICAL REVIEW B | 1992年 / 45卷 / 22期
关键词
D O I
10.1103/PhysRevB.45.12965
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A gauge-invariant theory for the effects of impurities on the electronic Raman scattering by pairs of quasiparticles in superconductors is presented. Special attention is given to the role of symmetry. The Raman spectrum for a superconductor is calculated using the exact-eigenstate formalism to account for impurity scattering in each symmetry channel L. We find that the Raman spectrum is strongly affected by impurity scattering in channels L not-equal 0, and symmetry-dependent line shapes can be obtained for anisotropic impurity scattering. For strong impurity scattering the peak of the Raman spectra does not coincide with the energy gap. Also, the bound states and phonon spectral function in the L not-equal 0 channel are investigated. Implications for the Raman spectra of the cuprates are discussed.
引用
收藏
页码:12965 / 12975
页数:11
相关论文
共 41 条
[1]   QUASIPARTICLE LIFETIME IN DISORDERED TWO-DIMENSIONAL METALS [J].
ABRAHAMS, E ;
ANDERSON, PW ;
LEE, PA ;
RAMAKRISHNAN, TV .
PHYSICAL REVIEW B, 1981, 24 (12) :6783-6789
[2]  
Abrikovsov A. A., 1974, ZH EKSP TEOR FIZ+, V38, P417
[3]   FERMI-SURFACE HARMONICS - GENERAL METHOD FOR NONSPHERICAL PROBLEMS - APPLICATION TO BOLTZMANN AND ELIASHBERG EQUATIONS [J].
ALLEN, PB .
PHYSICAL REVIEW B, 1976, 13 (04) :1416-1427
[4]   THEORY OF DIRTY SUPERCONDUCTORS [J].
ANDERSON, PW .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1959, 11 (1-2) :26-30
[5]   EXCITONS AND PLASMONS IN SUPERCONDUCTORS [J].
BARDASIS, A ;
SCHRIEFFER, JR .
PHYSICAL REVIEW, 1961, 121 (04) :1050-&
[6]   ELECTROMAGNETIC RESPONSE OF DISORDERED SUPERCONDUCTORS [J].
BELITZ, D ;
DESOUZAMACHADO, S ;
DEVEREAUX, TP ;
HOARD, DW .
PHYSICAL REVIEW B, 1989, 39 (04) :2072-2083
[7]   RAMAN-SCATTERING BY INTERVALLEY CARRIER-DENSITY FLUCTUATIONS IN N-TYPE SI - INTERVALLEY AND INTRAVALLEY MECHANISMS [J].
CONTRERAS, G ;
SOOD, AK ;
CARDONA, M .
PHYSICAL REVIEW B, 1985, 32 (02) :924-929
[8]  
Cooper S. L., 1990, Comments on Condensed Matter Physics, V15, P99
[9]   POWER-LAW TEMPERATURE-DEPENDENCE OF THE INELASTIC-SCATTERING RATE IN DISORDERED SUPERCONDUCTORS [J].
DEVEREAUX, TP ;
BELITZ, D .
PHYSICAL REVIEW B, 1991, 43 (04) :3736-3739
[10]   QUASI-PARTICLE INELASTIC LIFETIMES IN DISORDERED SUPERCONDUCTING FILMS [J].
DEVEREAUX, TP ;
BELITZ, D .
PHYSICAL REVIEW B, 1991, 44 (09) :4587-4600