Vortex fluctuations in underdoped Bi2Sr2CaCu2O8+d crystals

Details Vortex fluctuations in underdoped Bi2Sr2CaCu2O8+d crystals Vortex fluctuations in underdoped Bi2Sr2CaCu2O8+d crystals

2002-04-23

arxiv.org/abs/cond-mat/0204493v2

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.137002

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, lambda_{L,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 r_{w} of vortex pancakes. The temperature dependence of r_{w} 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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