A. Kortyka, R. Puzniak, A. Wisniewski, M. Zehetmayer, H. W. Weber, Y.Q. Cai, X. Yao:
"Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped YBa2Cu3O7−δ single crystals";
Superconductor Science and Technology, 23 (2010), S. 065001 - 065007.

Kurzfassung englisch:
The influence of low-level Pr substitution in Y1−xPrxBa2Cu3O7−δ single crystals on the
anisotropy of the superconducting state parameters was investigated by torque magnetometry in
magnetic fields of up to 9 T. An averaged anisotropy parameter, γ , of 7.4 was found and no
influence of the Pr ion concentration on γ was observed up to a Pr content of 2.4%. A
pronounced maximum at angles between 0.5 and 1 out of the ab-plane was observed for all
crystals in the irreversible angular dependence of the torque. This maximum is attributed to
intrinsic pinning associated with kinked vortices. The variation of the irreversible torque with
the substitution level indicates the influence of the Pr content on pinning within the CuO2
planes, even though the anisotropy of the superconducting state parameters is not affected.
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