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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 YBa₂Cu₃O_7−δ single crystals";
Superconductor Science and Technology, 23 (2010), 065001 - 065007.

The influence of low-level Pr substitution in Y_1−xPr_xBa₂Cu₃O_7−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.
(Some figures in this article are in colour only in the electronic version)

http://dx.doi.org/10.1088/0953-2048/23/6/065001

http://publik.tuwien.ac.at/files/PubDat_185618.pdf