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

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).

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

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Cited by in corpus (5)

• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Magnetization of underdoped YBa${}_2$Cu${}_3$O${}_y$ above the irreversibility field
• Magnetic-field tuned anisotropy in superconducting Rb(x)Fe(2-y)Se(2)
• Coexistence of magnetic and charge order in a two-component order parameter description of the layered superconductors
• Vortex lock-in transition coinciding with the 3D to 2D crossover in YBa2Cu3O7