Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-15
Phys. Rev. B 84, 024514 (2011)
Physics
Condensed Matter
Superconductivity
7 pages, 6 figures, version2 - accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.84.024514
An overdoped YBa2Cu3O7 single crystal was studied by SQUID and torque magnetometry in order to investigate the temperature dependence of the anisotropy parameter close to the transition temperature T_c (0.87 T_c < T < T_c). Angle dependent torque measurements were performed and analyzed with the widely used Kogan model [Phys. Rev. B 38, 7049 (1988)] as well as with an extended model by Hao and Clem [Phys. Rev. Lett. 67, 2371 (1991)], taking into account the influence of the vortex cores on the magnetization. Both approaches yield similar results, with an out-of-plane anisotropy parameter around 6.5 which slightly increases with decreasing temperature, and a temperature independent in-plane anisotropy parameter gamma_ab}= 1.12(5).
Bosma S.
Erb Andreas
Keller Hugo
Puzniak Roman
Schilling Anne
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