Effect of thermal and quantum fluctuations on superfluid density in layered superconductors

S. N. Artemenko, S. V. Remizov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We calculate suppression of inter- and intra-layer superconducting currents due to equilibrium phase fluctuations and find that, in contrast to a recent prediction, the effect of thermal fluctuations cannot account for linear temperature dependence of the superfluid density in high-Tc superconductors at low temperatures. Quantum fluctuations are found to dominate over thermal fluctuations at low temperatures due to hardening of their spectrum caused by the Josephson plasma resonance. Near Tc sizeable thermal fluctuations are found to suppress the critical current in the stack direction stronger than in the direction along the layers. Fluctuations of quasi-particle branch imbalance make the spectral density of voltage fluctuations at small frequencies non-zero, in contrast to what may be expected from a naive interpretation of Nyquist formula.

Original languageEnglish
Pages (from-to)10-15
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume362
Issue number1-4
DOIs
Publication statusPublished - 1 Sep 2001

Keywords

  • Fluctuations
  • High-T
  • Layered crystal
  • Noise
  • Superconductor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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