Fully gapped spin-singlet superconductivity in noncentrosymmetric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PbTaSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>207</mml:mn></mml:mmultiscripts></mml:math>nuclear magnetic resonance study

Maeda, S.; Matano, Kazuaki; 鄭, 国慶

doi:10.1103/physrevb.97.184510

Cited by 23 publications

(21 citation statements)

References 51 publications

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“…These structures were not observed in polycrystalline PbTaSe 2 [29]. Furthermore, sign inversion of S xx was observed near 8 K and 4 K. The former seems to reflect the multipolarity of carriers in PbTaSe 2 , and the latter corresponds to superconducting (SC) transition, since the temperature at the center of the S xx jump coincides with the SC transition temperature in previous reports [24,26,[29][30][31][38][39][40][41]. A nonzero S xx observed in the SC state probably originates from the gold and/or copper used in the leading wire and heat sink/diffuser.…”

supporting

confidence: 52%

Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe$_2$

Yokoi,

Murakawa,

Sakai

et al. 2021

Preprint

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PbTaSe 2 is a unique topological material, in which the number of nodal lines is expected to change at the structural transition between the lower temperature/pressure "L" phase and the higher temperature/pressure "H" phase. We report the anomalous Nernst effect attributed to the Berry curvature of nodal lines and its change with the structural transition. In the L phase, the Nernst coefficient (S yx ) shows the step-like magnetic field dependence reminiscent of the anomalous Nernst effect of nonmagnetic Dirac/Weyl semimetals. By applying hydrostatic pressure, we discovered that the amplitude of the anomalous component significantly decreases at the transition to the H phase, which might correspond to the partial annihilation of nodal line structures.

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supporting

confidence: 52%

Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe$_2$

Yokoi,

Murakawa,

Sakai

et al. 2021

Preprint

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“…Zero-field muon spin relaxation (µSR) measurement show no evidence for a TRS breaking field greater than 0.05 G in the superconducting state [23]. Different techniques, including specific heat and nuclear magnetic resonance (NMR) measurements [17,24], agree with an in-plane fully gapped superconducting state of PbTaSe 2 . A recent calculation work suggest multi-band superconductivity due to the complex band structure revealed by ARPES [18,19,25].…”

Section: Introductionmentioning

confidence: 95%

Muon spin rotation and relaxation study on topological noncentrosymmetric superconductor PbTaSe$_2$

Zhu,

Tan,

Zhang

et al. 2021

Preprint

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Topological superconductivity is an exotic phenomenon due to the symmetry-protected topological surface state, in which a quantum system has an energy gap in the bulk but supports gapless excitations confined to its boundary. Symmetries including central and time-reversal (TRS), along with their relations with topology, are crucial for topological superconductivity. We report muon spin relaxation/rotation (µSR) experiments on a topological noncentrosymmetric superconductor PbTaSe2 to study its TRS and gap symmetry. Zero-field µSR experiments indicate the absence of internal magnetic field in the superconducting state, consistent with previous µSR results. Furthermore, transverse-field µSR measurements reveals that the superconducting gap of PbTaSe2 is an isotropic three-dimensional fully-gapped single-band. The fully-gapped results can help understand the pairing mechanism and further classify the topological superconductivity in this system.

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“…1a, even though the Ta atom is off the crystal inversion center. Bulk superconductivity in PbTaSe 2 has been reported with T c around 3.7 K and a fully gapped spin-singlet superconducting state has been claimed by NMR, thermal conductivity and penetration depth studies on PbTaSe 2 [29][30][31]. The scanning tunneling microscopy (STM) observations suggest that the topological surface states in PbTaSe 2 display a nodeless SC with probable Majorana zero-energy modes in its vortex cores [32].…”

Section: Introductionmentioning

confidence: 99%

Evidence for nematic superconductivity of topological surface states in PbTaSe2

Sun

Jin

et al. 2020

Science Bulletin

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Spontaneous symmetry breaking has been a paradigm to describe the phase transitions in condensed matter physics. In addition to the continuous electromagnetic gauge symmetry, an unconventional superconductor can break discrete symmetries simultaneously, such as time reversal and lattice rotational symmetry. In this work we report a characteristic in-plane 2-fold behaviour of the resistive upper critical field and point-contact spectra on the superconducting semimetal PbTaSe 2 with topological nodal-rings, despite its hexagonal lattice symmetry (or D 3h in bulk while C 3v on surface, to be precise). The 2-fold behaviour persists up to its surface upper critical field H R c2 even though bulk superconductivity has been suppressed at its bulk upper critical field H HC c2 ( H R c2 , signaling its probable surface-only electronic nematicity. In addition, we do not observe any lattice rotational symmetry breaking signal from field-angle-dependent specific heat within the resolution. It is worth noting that such surface-only electronic nematicity is in sharp contrast to the observation in the topological superconductor candidate, Cu x Bi 2 Se 3 , where the nematicity occurs in various bulk measurements. In combination with theory, superconducting nematicity is likely to emerge from the topological surface states of PbTaSe 2 , rather than the proximity effect. The issue of time reversal symmetry breaking is also addressed. Thus, our results on PbTaSe 2 shed new light on possible routes to realize nematic superconductivity with nontrivial topology.

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Fully gapped spin-singlet superconductivity in noncentrosymmetricPbTaSe2:Pb207nuclear magnetic resonance study

Cited by 23 publications

References 51 publications

Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe$_2$

Anomalous Nernst Effect in Nonmagnetic Nodal Line Semimetal PbTaSe$_2$

Muon spin rotation and relaxation study on topological noncentrosymmetric superconductor PbTaSe$_2$

Evidence for nematic superconductivity of topological surface states in PbTaSe2

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