Effects of gap anisotropy on the electromagnetic response of high- T sub c superconductors

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.300· OSTI ID:5755704

Press, M R; Jha, S S ^[1]

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1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005, India (IN)

We study the nature of the electromagnetic absorption in a superconductor with an anisotropic energy gap and a nonspherical Fermi surface that is either completely closed or open along the direction of the {ital c} axis of the crystal. The real part of the electromagnetic conductivity {sigma}{sub {mu}{nu}}({bold q},{omega}) has been calculated for a wide range of the normal-state collision frequency {omega}{sub {ital c}} and the parameter {ital Q}=max{l brace}{vert bar}{bold q}{center dot}{bold V}{sub {ital F}}{vert bar}{r brace}, where {bold q} is the incident wave vector of the electromagnetic wave and {bold V}{sub {ital F}} is quasiparticle velocity at the Fermi surface. For simplicity, the model gap parameter {Delta}({bold k}) is assumed to vary only with the angle {theta} between the direction {bold {cflx k}} of the quasiparticle wave vector and the {ital c} axis of the crystal (chosen to be the {ital z} direction). We employ a formulation for calculating the linear conductivity in which the collision frequency is directly related to the imaginary part of the single-particle self-energy resulting from various elastic and inelastic collisions.

• OSTI ID: 5755704
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ANISOTROPY
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY GAP
ENERGY LEVELS
FERMI LEVEL
FUNCTIONS
HIGH-TC SUPERCONDUCTORS
RADIATIONS
RESPONSE FUNCTIONS
SELF-ENERGY
SPECTRA
SUPERCONDUCTORS