The effective mass anisotropy ratio gamma is generally determined relative to the main axes of a superconductor. Torque measurements with arbitrary field orientations, especially near the ab-plane, are presented. The scaling of the apparent anisotropy ratio gamma(app) is verified also very close to the ab-plane in the highly anisotropic La(1.9)Sr(0.1)CuO(4). This method allows a very precise determination of gamma(ac) and shows the importance of the field orientation for ab-plane measurements.
By: M. Willemin, C. Rossel, J. Hofer, H. Keller, and A. Revcolevschi
Published in: Physical Review B, volume 59, (no 2), pages 717-20 in 1999
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