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Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry |
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| Authors: | S Weyeneth R Puzniak U Mosele N D Zhigadlo S Katrych Z Bukowski J Karpinski S Kohout J Roos H Keller |
| Affiliation: | 1. Physik-Institut der Universit?t Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland 2. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668, Warsaw, Poland 3. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland |
| Abstract: | Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1 μg 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. |
| Keywords: | Oxypnictides Anisotropy Multi-band superconductivity Single crystal Torque magnetometry |
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