Thursday, August 16, 2012

1208.3062 (S. Bosma et al.)

Vortex lock-in transition coinciding with the 3D to 2D crossover in
YBa2Cu3O7
   [PDF]

S. Bosma, S. Weyeneth, R. Puzniak, A. Erb, H. Keller
A vortex lock-in transition was directly detected by torque magnetometry in an overdoped YBa2Cu3O7 single crystal of low anisotropy (\approx 7). The locked-in state was observed below the 3D to 2D crossover temperature Tcr = 76 K, independently of extrinsic pinning effects thanks to a high quality clean crystal and the use of a vortex shaking technique. The shape of the torque signal as a function of the angle between the applied magnetic field and the crystallographic c-axis is in very good agreement with the model developped by Feinberg and Ettouhami [Int. J. Mod. Phys. B 7, 2085 (1993)] for quasi-2D superconductors, despite the low anisotropy of the material.
View original: http://arxiv.org/abs/1208.3062

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