Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry
Weyeneth, S. ; Puzniak, R. ; Mosele, U. ; Zhigadlo, N. ; Katrych, S. ; Bukowski, Z. ; Karpinski, J. ; Kohout, S. ; Roos, J. ; Keller, H.
In: Journal of Superconductivity and Novel Magnetism, 2009, vol. 22, no. 4, p. 325-329
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- Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1μg were grown by a high-pressure cubic anvil technique. The use of a high-sensitive piezoresistive torque sensor made it possible to study the anisotropic magnetic properties of these tiny crystals. The anisotropy parameter γ was found to be field independent, but varies strongly with temperature ranging from γ≃8 at T≲T c to γ≃23 at T≃0.4T c. This unusual behavior of γ signals unconventional superconductivity