Specific heat and critical field for some iron-containing superconductors |
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| Authors: | G. R. Stewart G. P. Meisner C. U. Segre |
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| Affiliation: | (1) Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico;(2) Department of Physics, Illinois Institute of Technology, Chicago, Illinois |
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| Abstract: | Specific heat measurements on superconductingLu2Fe3Si5 reveal a strong sample dependence of the residual specific heat contribution  s, belowTc, effectively ruling out the possibility of a two-band model. Upper critical fieldHc2 results for Lu2Fe3Si5, Sc2Fe3Si5, and LaFe4P12 show a very largeHc2 with an unusual temperature dependence for Lu2Fe3Si5, in contrast to the latter two compounds, implying a strongly sample-dependentHc2 as well. Intrinsic magnetic impurities arising from structural disorder and defects are possibly the origin of these anomalous superconducting state properties of Lu2Fe3Si5. |
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