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Specific heat and critical field for some iron-containing superconductors

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Abstract

Specific heat measurements on superconductingLu 2 Fe 3 Si 5 reveal a strong sample dependence of the residual specific heat contribution γ s , belowT c , effectively ruling out the possibility of a two-band model. Upper critical fieldH c2 results for Lu2Fe3Si5, Sc2Fe3Si5, and LaFe4P12 show a very largeH c2 with an unusual temperature dependence for Lu2Fe3Si5, in contrast to the latter two compounds, implying a strongly sample-dependentH c2 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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Authors and Affiliations

  1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico

    G. R. Stewart & G. P. Meisner

  2. Department of Physics, Illinois Institute of Technology, Chicago, Illinois

    C. U. Segre

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  1. G. R. Stewart
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  2. G. P. Meisner
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  3. C. U. Segre
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Stewart, G.R., Meisner, G.P. & Segre, C.U. Specific heat and critical field for some iron-containing superconductors. J Low Temp Phys 59, 237–245 (1985). https://doi.org/10.1007/BF00683777

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