Crossover from vortex-to-fluctuation picture in the vast vortex-liquid state of cuprate superconductors La2-xSrxCuO4 probed by microwave complex conductivity measurement technique

Atsutaka Maeda, Ryo Tanaka, Takeyoshi Ohashi, Yoshinori Imai, Haruhisa Kitano, Ichiro Tsukada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We investigate microwave complex conductivity of La2-xSr xCuO4 under finite magnetic fields by broadband technique, and analyze the result from the two alternative viewpoints; (1) superconductivity fluctuation, and (2) vortex motion. For higher fields, conventional scaling relation between conductivity and frequency does not hold. We propose a new "scaling" relation for these data. On the other hand, vortex picture works even in the vortex liquid state. However, a strange behavior of superfluid density indicates that the vortex picture alone cannot explain the whole behavior even just above the first order transition line.

Original languageEnglish
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

Keywords

  • Broadband
  • Fluctuation
  • Microwave conductivity
  • Vortex

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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