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Magnetic torque study of the temperature-dependent anisotropy parameter in overdoped superconducting single-crystal YBa2Cu3O7


Bosma, S; Weyeneth, S; Puzniak, R; Erb, A; Schilling, A; Keller, H (2011). Magnetic torque study of the temperature-dependent anisotropy parameter in overdoped superconducting single-crystal YBa2Cu3O7. Physical Review B, 84(2):024514.

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 Tc (0.87Tc<T<Tc). 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 γab=1.12(5).

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 Tc (0.87Tc<T<Tc). 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 γab=1.12(5).

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2011
Deposited On:24 Oct 2011 13:18
Last Modified:05 Apr 2016 15:02
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.84.024514
Related URLs:http://arxiv.org/abs/1102.2990

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