Vortex fluctuations in underdoped Bi2Sr2CaCu2O8+δ single crystals

Sylvain Colson 3Marcin Konczykowski 3Marat B. Gaifullin 4Yuji Matsuda 4P. Gierłowski 1Ming Li 2Peter H. Kes 2Cornelis J. van der Beek 3

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Kamerlingh Onnes Laboratory, Leiden University, Niels Bohrweg 2, Leiden 2333 CA, Netherlands
3. Ecole Polytechnique (X), route de Saclay, Palaiseau 91128, France
4. Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan

Abstract

Thermal fluctuations of vortices were studied by microwave measurements of the Josephson Plasma Resonance (JPR) in small single crystals of underdoped Bi2Sr2CaCu2O8+δ with a critical temperature Tc = 69.4 K and a zero-field JPR-frequency of approx. 61 GHz. The penetration depth along the c-axis and the anisotropy ratio γ were calculated from zero-field data. The dc magnetic field and temperature dependences of the wandering length of pancake vortices were examined over the entire vortex solid state and explained by the renormalization of the vortex line tension by the fluctuations, finally leading to the dissociation of the vortices at the first order transition.

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Presentation: oral at E-MRS Fall Meeting 2004, Symposium E, by Piotr Gierłowski
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-07-21 11:32
Revised:   2009-06-08 12:55
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