Superconducting properties of Lu2Fe3Si5with non-magnetic impurities

Sasame, Hiroki; Masubuchi, Toshihiro; Takase, Kouichi; Takano, Yoshiki; Watanabe, T.

doi:10.1088/1742-6596/150/5/052226

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Such an interaction enables also the extended s-wave (s± wave) superconductivity, for which the sign of the order parameter would be opposite for the hole-and electronlike FS sheets. This is consistent with recent experimental data [20,25,[28][29][30][31][32], in analogy to the situation in the high-Tc (oxy)pnictides [42].…”

Section: Resultssupporting

confidence: 92%

“…Nevertheless, any unconventional (non-phononic) mechanism of their superconductivity may be similar to those already postulated for a majority of iron-based compounds. These conclusions are in accord with the findings of recent various experiments presented in [28][29][30][31][32]. …”

Section: Discussionsupporting

confidence: 93%

“…The anisotropy of their superconducting properties, anomalous upper critical fields (in Lu2Fe3Si5), and inter-band electron scattering in the case of two weak-coupled distinct gaps opened on the whole Fermi surface (FS) sheets, indicated that they are rather quasi-2D superconductors [26][27][28][29]. Furthermore, some recent works [30][31][32] focused on the effect of doping by non-magnetic impurities and atomic disorder induced by the neutron irradiation, both causing a fast suppression of TC in Lu2Fe3Si5, have questioned the conventional (phononic) mechanism of SC in the (Lu;Y;Sc)2Fe3Si5 family, revealing the significance of spin fluctuations in formation of the SC state [32]. The same effect was observed in the high-TC (oxy)pnictides after irradiation and, hence, it might be universal for all iron-based superconductors.…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure and Fermi surface of iron-based superconductors R2Fe3Si5 (R = Lu;Y;Sc) from first principles

Samsel‐Czekała

Winiarski

2012

Intermetallics

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Electronic structures of three superconducting rare-earth iron silicides (Lu;Y;Sc)2Fe3Si5 and nonsuperconducting Lu2Ru3Si5, adopting a tetragonal crystal structure (P4/mnc), have been calculated employing the full-potential local-orbital method within the density functional theory. The investigations were focused particularly on the band structures and Fermi surfaces, existing in four bands and containing rather threedimensional electronlike and holelike sheets. They support an idea of unconventional multi-band superconductivity in these ternaries, proposed earlier by other authors for Lu2Fe3Si5, based on heat-capacity, resistivity, electromagnetic and muon spin rotation measurements. Finally, a discussion on differences in the electronic structures between the investigated here and other common families of iron-based superconductors is carried out.

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Section: Resultssupporting

confidence: 92%

Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Electronic structure and Fermi surface of iron-based superconductors R2Fe3Si5 (R = Lu;Y;Sc) from first principles

Samsel‐Czekała

Winiarski

2012

Intermetallics

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“…As a result, the stack of Fe1 4 and Lu 4 squares alternating along the axis с can be considered as a corrugated metal tube. Inside this tube, chains of So far, the role of Fe and Lu atoms in the emergence of superconductivity has remained partially unclear [50][51][52][53][54]. If just 3d-electrons of Fe are responsible for superconductivity, this superconducting fragment must be considered as a stack of metal clusters Fe1 4 with chains of Si3 atoms inside it and Lu, Si1, and Si2 atoms outside it.…”

Section: Mrux Superconducting Transitionmentioning

confidence: 99%

Prediction of inorganic superconductors with quasi-one-dimensional crystal structure

Волкова¹,

Marinin²

2013

Supercond. Sci. Technol.

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Models of superconductors having a quasi-one-dimensional crystal structure based on the convoluted into a tube Ginzburg sandwich, which comprises a layered dielectric-metal-dielectric structure, have been suggested. The critical crystal chemistry parameters of the Ginzburg sandwich determining the possibility of the emergence of superconductivity and the Т с value in layered high-T c cuprates, which could have the same functions in quasi-onedimensional fragments (sandwich-type tubes), have been examined. The crystal structures of known low-temperature superconductors, in which one can mark out similar quasi-one-dimensional fragments, have been analyzed. Five compounds with quasi-one-dimensional structures, which can be considered as potential parents of new superconductor families, possibly with high transition temperatures, have been suggested. The methods of doping and modification of these compounds are provided.

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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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Superconducting properties of Lu₂Fe₃Si₅with non-magnetic impurities

Cited by 5 publications

References 12 publications

Electronic structure and Fermi surface of iron-based superconductors R2Fe3Si5 (R = Lu;Y;Sc) from first principles

Electronic structure and Fermi surface of iron-based superconductors R2Fe3Si5 (R = Lu;Y;Sc) from first principles

Prediction of inorganic superconductors with quasi-one-dimensional crystal structure

The electronic structure of rare-earth iron silicide R2Fe3Si5 superconductors

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