Magnetic torque study of the temperature dependent anisotropy parameter in overdoped superconducting single-crystal YBa_2Cu_3O_7

S. Bosma; S. Weyeneth; R. Puzniak; A. Erb; A. Schilling; H. Keller

doi:10.1103/PhysRevB.84.024514

Magnetic torque study of the temperature dependent anisotropy parameter in overdoped superconducting single-crystal YBa_2Cu_3O_7

Superconductivity 2011-07-14 v3

Authors: S. Bosma , S. Weyeneth , R. Puzniak , A. Erb , A. Schilling , H. Keller

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Abstract

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).

Keywords

magnetic torque anisotropy parameter overdoped superconductor YBa2Cu3O7 vortex cores Kogan model Hao-Clem model

Cite

@article{arxiv.1102.2990,
  title  = {Magnetic torque study of the temperature dependent anisotropy parameter in overdoped superconducting single-crystal YBa_2Cu_3O_7},
  author = {S. Bosma and S. Weyeneth and R. Puzniak and A. Erb and A. Schilling and H. Keller},
  journal= {arXiv preprint arXiv:1102.2990},
  year   = {2011}
}

Comments

7 pages, 6 figures, version2 - accepted for publication in PRB

Magnetic torque study of the temperature dependent anisotropy parameter in overdoped superconducting single-crystal YBa_2Cu_3O_7

Abstract

Keywords

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