Phenomenological model of the copper oxide superconductors

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.2073· OSTI ID:6993404

Klemm, R A ^[1]

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1. Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011 (US)

We propose a phenomenological model for the copper oxide superconductors in which one complex {ital s}-wave order parameter (OP) is associated with each of the {ital N} conducting layers per unit cell, with {ital N}{minus}1 equal spacings {ital d} and one different spacing {ital d}{prime}; the {ital c} axis repeat distance {ital s}={ital d}{prime}+({ital N}{minus}1){ital d}. The layers are coupled by Josephson-like tunneling, with parameters {zeta}{sub 1} and {zeta}{sub 2}, respectively. The Gaussian fluctuation free energy is diagonalized, yielding {ital N} distinct {ital T}{sub {ital c}} values. Just above the highest {ital T}{sub {ital c}}, the fluctuations are usually dominated by the three-dimensional (3D) regime of a single cellular OP. In the 2D regime further above {ital T}{sub {ital c}}, more of the OP's contribute to the fluctuations, their relative contributions depending upon the {zeta}{sub 1} and {zeta}{sub 2} values. The temperature ({ital T}) and angular ({theta}) dependence of the resulting fluctuation magnetization {bold M}({theta},{ital T}) is calculated.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6993404
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:4; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
CRYSTALS
DE HAAS-VAN ALPHEN EFFECT
ENERGY
FLUCTUATIONS
FREE ENERGY
FUNCTIONAL MODELS
MAGNETIZATION
MONOCRYSTALS
ORDER PARAMETERS
OXIDES
OXYGEN COMPOUNDS
PARTIAL WAVES
PHYSICAL PROPERTIES
S WAVES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT
VARIATIONS