Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5 |
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Authors: | Y Nakajima H Hidaka T Tamegai T Nishizaki T Sasaki N Kobayashi |
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Institution: | aDepartment of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;bInstitute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan |
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Abstract: | We report the upper critical field Hc2 in a ternary iron-silicide superconductor Lu2Fe3Si5 with Tc 6 K obtained by the resistivity measurements. We find that Hc2 increases linearly with decreasing temperature down to Tc/3, and Hc2(T = 0) exceeds the orbital depairing field described by the Werthamer–Helfand–Hohenberg theory. We also find that the anisotropy of Hc2 is nearly independent of temperature and the angular dependence of Hc2 is well-described by the anisotropic Ginzburg–Landau model. These results strongly indicate the presence of two distinct superconducting gaps in Lu2Fe3Si5 although the behavior is slightly different from that of the typical two-gap superconductor MgB2. |
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Keywords: | Two-gap superconductor Upper critical field Lu2Fe3Si5 MgB2 |
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