The Josephson plasma resonance as a "scattering" probe of vortex correlation in the liquid state

N. P. Ong, Sibel P. Bayrakci, Ophelia K.C. Tsui, K. Kishio, S. Watauchi

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

In the vortex liquid state the Josephson plasma frequency ωp is strongly affected by fluctuations in the vortex pancakes. We have measured in detail the variation of ωp with field B and tilt angle θ in Bi2Sr2CaCu2O8. We compare the data with Koshelev's expression relating ωp to the correlation function of the local phase S1. The agreement is quite close for θ > 1°, provided f varies with B with a weak exponent (f measures the number of pancakes within a correlated area). A scattering picture is introduced to clarify how the plasma resonance is equivalent to a Fourier transform of |S1|2 . From the fit, we find that, at 50 K and 1 T, f ≈ 1.4 pancakes, Jc0 equals 4160 A/cm2 and 〈cos φn,n+1〉 = 0.028. Deviations observed when B is aligned with the planes are discussed.

Original languageEnglish (US)
Pages (from-to)20-24
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume293
Issue number1-4
DOIs
StatePublished - Dec 1997

All Science Journal Classification (ASJC) codes

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

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