Vortex fluctuations in underdoped Bi2Sr2CaCu2O8+d crystals
S. Colson, M. Konczykowski, M. B. Gaifullin, Y. Matsuda, P. Gierlowski, M. Li, P. H. Kes, C. J. van der Beek
Abstract
Vortex thermal fluctuations in heavily underdoped Bi2Sr2CaCu2O8+d (Tc=69.4 K) are studied using Josephson plasma resonance (JPR). From the data in zero magnetic field, we obtain the penetration depth along the c-axis, lambdaL,c(0) = 229 micrometers and the anisotropy ratio gamma(0) = 600. The low plasma frequency allows us to study phase correlations over the whole vortex solid (Bragg-glass) state. The JPR results yield a wandering length rw of vortex pancakes. The temperature dependence of rw as well as its increase with applied dc magnetic field can only be explained by the renormalization of the tilt modulus by thermal fluctuations, and suggest the latter is responsible for the dissociation of the vortices at the first order transition.
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