Impurity effects in two-gap superconductor Lu2Fe3Si5

Hidaka, H.; Nakajima, Yasuyuki; Tamegai, T.

doi:10.1016/j.physc.2009.10.119

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The interband electron scattering between these two weak-coupled gaps opened on the whole Fermi surface (FS) is the reason for an observed anisotropy of superconducting properties in the 235-type iron silicides being rather quasi-2D superconductors [24,25,26,27,28,29]. Furthermore, the conventional (phononic) character of an SC mechanism in Lu 2 Fe 3 Si 5 has been questioned by a fast suppression of T c caused by non-magnetic impurities and atomic disorder induced by the neutron irradiation [30,31,32]. These effects might be explained by spin-fluctuation mediated scenario of SC, similarly to that postulated in iron (oxy)pnictides.…”

Section: Introductionmentioning

confidence: 99%

The electronic structure of rare-earth iron silicide R2Fe3Si5 superconductors

Winiarski

Samsel‐Czekała

2013

Solid State Sciences

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The electronic structures of R 2 Fe 3 Si 5 (where R = Lu, Tm, Er, Tb, Yb) intermetallics have been calculated from first principles in local-spin density (LSDA) and LSDA+U approaches. The majority of rare-earth iron silicides, except for the heavy-fermion Yb-based compound, exhibit almost equal values of density of states at the Fermi level (E F ) as well as very similar Fermi surface topology. The electronic structure around E F in the 235-type Febased compounds is completely dominated by the Fe 3d states. Thus the different superconducting properties of some members of the R 2 Fe 3 Si 5 family are rather related to a presence of local magnetic moments of R-atoms than to electronic-structure features at E F .

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Section: Introductionmentioning

confidence: 99%

The electronic structure of rare-earth iron silicide R2Fe3Si5 superconductors

Winiarski

Samsel‐Czekała

2013

Solid State Sciences

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“…Specific heat, 9 penetration depth, 10 and thermal conductiv-ity studies 11 suggest that the superconducting gaps are fully opened on the whole Fermi surface. However, interestingly, a rapid decrease in T c is reported when a small amount of nonmagnetic impurities replace some of Lu or Si sites, [12][13][14] which leads us to speculate that the sign of the superconducting gap functions is reversing on and/or between the Fermi surfaces such as the s ± -wave state. In order to reveal the peculiar superconducting properties in the multigap superconductor Lu 2 Fe 3 Si 5 , it is crucial to investigate the detailed nature of the multigap structure.…”

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confidence: 99%

Two-band superconductivity featuring different anisotropies in the ternary iron silicide Lu2Fe3Si5

et al. 2012

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We report detailed studies of the upper critical field and low-temperature specific heat in the two-gap superconductor Lu2Fe3Si5. The anisotropy of the upper critical field suggests that the active band is quasi-one-dimensional. Low-temperature specific heat in magnetic fields reveals that the virtual Hc2 in the passive band is almost isotropic. These results strongly indicate that the two bands have two different anisotropies, similar to the typical two-gap superconductor MgB2, and their interplay may be essential to the two-gap superconductivity in Lu2Fe3Si5.

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