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

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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 correkated 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 fin that, at 50 K and 1 T, f ≈ 1.4 pancakes, Jc0 equals 4160 A/cm2 and 〈cosφn,n+1〉 = 0.028. Deviations observed when B is aligned with the planes are discussed.

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Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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