Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5

Nakajima, Yasuyuki; Hidaka, H.; Tamegai, T.; Nishizaki, Terukazu; Sasaki, T.; Kobayashi, Norio

doi:10.1016/j.physc.2009.05.099

Cited by 9 publications

(11 citation statements)

References 10 publications

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“…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%

“…This finding is also in good agreement with those reported in the previous work [21], where merely Lu2Fe3Si5 was probed by the different from ours band-structure method (FLAPW) and also by employing various techniques of measurements. In analogy to MgB2 [33], the postulated source of the multi-gap SC in Lu2Fe3Si5 is first of all weak inter-band interactions between the multiple bands having different dimensionality [28]. In addition, the iron silicides exhibit moderately strong correlations between the Fe 3d electrons [29].…”

Section: Resultsmentioning

confidence: 99%

“…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].…”

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: Discussionsupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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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“…It should be noted that both H c2 (T ) dependences show extended linear regions in the measured temperature range. Recent measurements of H c2 (T ) down to 0.4 K confirm this tendency [13]. Figure 5 shows the temperature dependence of specific heat in Lu 2 Fe 3 Si 5 .…”

Section: Lu 2 Fe 3 Simentioning

confidence: 57%

Two-gap superconductivity inR₂Fe₃Si₅(R=Lu, Sc) and Sc₅Ir₄Si₁₀

Tamegai

Nakajima

Nakagawa

et al. 2008

Science and Technology of Advanced Materials

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R 2 Fe 3 Si 5 (R = Sc, Y, Lu) contains nonmagnetic iron and has a relatively high superconducting transition temperature T c among iron-containing superconductors. An anomalous temperature dependence of specific heat C(T) has been reported for polycrystalline samples down to 1 K. We have grown R 2 Fe 3 Si 5 single crystals, confirmed the anomalous C(T) dependence, and found a second drop in specific heat below 1 K. In Lu 2 Fe 3 Si 5 , we can reproduce C(T) below T c , assuming two distinct energy gaps 2 1 /k B T c = 4.4 and 2 2 /k B T c = 1.1, with nearly equal weights, indicating that Lu 2 Fe 3 Si 5 is a two-gap superconductor similar to MgB 2 . Hall coefficient measurements and band structure calculation also support the multiband contributions to the normal-state properties. The specific heat in the Sc 2 Fe 3 Si 5 single crystals also shows the two-gap feature. R 5 Ir 4 Si 10 (R = Sc, rare earth) is also a superconductor where competition between superconductivity and the charge-density wave is known for rare earths but not for Sc. We have performed detailed specific heat measurements on Sc 5 Ir 4 Si 10 single crystals and found that C(T) deviates slightly from the behavior expected for weak-coupling superconductors. C(T) for these superconductors can also be reproduced well by assuming two superconducting gaps.

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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].…”

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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Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5

Cited by 9 publications

References 10 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

Two-gap superconductivity inR₂Fe₃Si₅(R=Lu, Sc) and Sc₅Ir₄Si₁₀

The electronic structure of rare-earth iron silicide R2Fe3Si5 superconductors

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Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5

Cited by 9 publications

References 10 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

Two-gap superconductivity inR2Fe3Si5(R=Lu, Sc) and Sc5Ir4Si10

The electronic structure of rare-earth iron silicide R2Fe3Si5 superconductors

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Two-gap superconductivity inR₂Fe₃Si₅(R=Lu, Sc) and Sc₅Ir₄Si₁₀