Probing nodeless superconductivity in 
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 (
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, Pt) using muon-spin rotation and relaxation

P, Sajilesh K.; Singh, Deepak; Hillier, A. D.; Singh, R. P.

doi:10.1103/physrevb.102.094515

Cited by 7 publications

(1 citation statement)

References 59 publications

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“…8 suggests that Zr 3 Ir does not exhibit line or point node and has an isotropic gap, in agreement with the heat capacity results. The data were fitted within the local London approximation for a BCS superconductor in the clean limit [40], which yields that the superconducting energy gap (0) is 1.17(1) meV and (0) (2), greater than the BCS predicted value 1.76. This value is consistent with the specific heat measurement.…”

Section: Resultsmentioning

confidence: 99%

Superconducting ground state of the nonsymmorphic superconducting compound Zr2Ir

et al. 2021

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The nonsymmorphic Zr 2 Ir alloy is a possible topological semimetal candidate material and as such may be part of an exotic class of superconductors. Zr 2 Ir is a superconductor with a transition temperature of 7.4 K with critical fields of 19.6(3) mT and 3.79(3) T, as determined by heat capacity and magnetization. Zero-field muon spin relaxation measurements show that time-reversal symmetry is preserved in these materials. The specific heat and transverse field muon spin rotation measurements rule out any possibility to have a nodal or anisotropic superconducting gap, revealing a conventional s-wave nature in the superconducting ground state. Therefore this system is found to be a conventional nonsymmorphic superconductor, with time-reversal symmetry being preserved and an isotropic superconducting gap.

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Section: Resultsmentioning

confidence: 99%

Superconducting ground state of the nonsymmorphic superconducting compound Zr2Ir

et al. 2021

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La4TX (T = Ru, Rh, Ir; X = Al, In): A family of noncentrosymmetric superconductors with tunable antisymmetric spin-orbit coupling

Luo

et al. 2022

Sci. China Mater.

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We report the discovery of superconductivity in a series of noncentrosymmetric compounds La 4 TX (T = Ru, Rh, Ir; X = Al, In), which have a cubic crystal structure with the space group F m 43 . La 4 RuAl, La 4 RhAl, La 4 IrAl, La 4 RuIn and La 4 IrIn exhibit bulk superconducting transitions with critical temperatures (T c ) of 0.61-3.35 K, while La 4 RhIn was not successfully synthesized. The specific heats of La 4 RuAl and La 4 RhAl are best accounted for by an s-wave model with a fully open superconducting gap, while a nodal gap cannot be excluded for La 4 IrAl, which has stronger antisymmetric spinorbit coupling (ASOC). In all cases, the upper critical fields are well described by the Werthamer-Helfand-Hohenberg model, and the values are well below the Pauli limit, indicating that orbital limiting is the dominant pair-breaking mechanism. Density functional theory (DFT) calculations reveal that the degree of band splitting by the ASOC shows considerable variation between the different compounds. This indicates that the strength of the ASOC is highly tunable across this series of superconductors, suggesting that they are good candidates for examining the relationship between ASOC and superconducting properties in noncentrosymmetric superconductors.

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Spin-triplet superconductivity in Weyl nodal-line semimetals

et al. 2022

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Topological semimetals are three dimensional materials with symmetry-protected massless bulk excitations. As a special case, Weyl nodal-line semimetals are realized in materials having either no inversion or broken time-reversal symmetry and feature bulk nodal lines. The 111-family, including LaNiSi, LaPtSi and LaPtGe materials (all lacking inversion symmetry), belongs to this class. Here, by combining muon-spin rotation and relaxation with thermodynamic measurements, we find that these materials exhibit a fully-gapped superconducting ground state, while spontaneously breaking time-reversal symmetry at the superconducting transition. Since time-reversal symmetry is essential for protecting the normal-state topology, its breaking upon entering the superconducting state should remarkably result in a topological phase transition. By developing a minimal model for the normal-state band structure and assuming a purely spin-triplet pairing, we show that the superconducting properties across this family can be described accurately. Our results demonstrate that the 111 materials reported here provide an ideal test-bed for investigating the rich interplay between the exotic properties of Weyl nodal-line fermions and unconventional superconductivity.

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Probing nodeless superconductivity in LaMSi ( M=Ni , Pt) using muon-spin rotation and relaxation

Abstract: This is a copy of the published version, or version of record, available on the publisher's website. This version does not track changes, errata, or withdrawals on the publisher's site.

Cited by 7 publications

References 59 publications

Superconducting ground state of the nonsymmorphic superconducting compound Zr2Ir

Superconducting ground state of the nonsymmorphic superconducting compound Zr2Ir

La4TX (T = Ru, Rh, Ir; X = Al, In): A family of noncentrosymmetric superconductors with tunable antisymmetric spin-orbit coupling

Spin-triplet superconductivity in Weyl nodal-line semimetals

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