Thermodynamics and response of a spin-charge-separated superconductor

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.6200· OSTI ID:115818

Sudbo, A ^[1]; Wheatley, J M ^[2]

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1. Department of Physics, Norwegian Institute of Technology, 7034 Trondheim-NTH (Norway)
2. Interdisciplinary Research Center in Superconductivity, Cambridge University, Madingley Road, Cambridge CB3 OHE (United Kingdom)

Thermodynamic and transport properties of a weak-coupling isotropic {ital s}-wave superconductor with a spin-charge separated normal state, are described. {ital T}{sub {ital c}} and the gap parameter {Delta}({ital T}) are enhanced by spin-charge separation. The ratio 2{Delta}(0)/{ital k}{sub {ital B}}{ital T}{sub {ital c}} is nonuniversal. Incoherent spectral weight is present below the gap, leading to a superconducting quasiparticle density of states {ital N}({omega}){similar_to}{omega}{sup 2}, {vert_bar}{omega}{vert_bar}{much_lt}{Delta}. For {ital T}/{ital T}{sub {ital c}}{much_lt}1, {ital power{minus}law} temperature corrections {ital O}({ital T}{sup 4}) to the gap, superfluid density, and Josephson critical current are found. Spin-charge separation leads to a normal fluid density which is nonvanishing at zero temperature, even in the clean limit. The conductance is nonzero at finite frequency in the superconducting state; in particular there is a sharp onset when {omega}{gt}{Delta}.

• Sponsoring Organization: USDOE
• OSTI ID: 115818
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGE STATES
CRITICAL CURRENT
ENERGY GAP
ENERGY-LEVEL DENSITY
JOSEPHSON EFFECT
S WAVES
SPECTRAL DENSITY
SPIN
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TRANSPORT THEORY