Ta181 nuclear quadrupole resonance study of the noncentrosymmetric superconductor PbTaSe2
K. Yokoi, M. Yashima, H. Murakawa, H. Mukuda, K. Yamauchi, T. Oguchi, H. Sakai, N. Hanasaki
DOI 10.1103/PhysRevB.102.214504 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report on a pure Ta181 nuclear quadrupole resonance (NQR) measurement of PbTaSe2 at zero magnetic field, which has the advantage of directly probing the intrinsic superconducting phase and electronic states of the TaSe2 layer. We observed the Ta181 NQR spectrum of the intrinsic structure with space group P6¯m2, which agrees well with density functional theory calculations. The nuclear spin relaxation rate 1/T1 shows an exponential decrease well below Tc, indicating that the superconducting state is fully gapped in the framework of BCS theory. The gap size obtained by Ta181 NQR was smaller than the value in previous reports, which may imply that the Fermi surfaces composed of Ta5d orbitals, where the average pairing interactions are expected to be weaker than in the BCS model, are primarily probed. The temperature dependence of 1/T1 below Tc can be reproduced well by the superposition of quadrupole and magnetic relaxation mechanisms, together with the distribution of the superconducting gap size inherent in multiple Fermi surfaces theoretically proposed in PbTaSe2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | onset |
Similar papers
Quantum oscillations in the noncentrosymmetric superconductor and topological nodal-line semimetal PbTaSe2
similarity 0.95Xitong Xu et al.
Source status unknown — claims are unverified
Ta Nuclear quadrupole resonance study of non-centrosymmetric superconductor PbTaSe
similarity 0.94K. Yokoi et al. · 2020 · arXiv:2012.14107
Source status unknown — claims are unverified
Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe2: Pb207 nuclear magnetic resonance study
similarity 0.94S. Maeda et al.
Source status unknown — claims are unverified
Superconducting properties in single crystals of the topological nodal semimetal PbTaSe2
similarity 0.94Cheng-Long Zhang et al.
Source status unknown — claims are unverified
Pressure-induced surface superconductivity in the noncentrosymmetric superconductor PbTaSe2: Pressure-dependent point-contact Andreev spectroscopy
similarity 0.94Hai Zi et al.
Source status unknown — claims are unverified
μSR study of the noncentrosymmetric superconductor PbTaSe2
similarity 0.93M. N. Wilson et al.
Source status unknown — claims are unverified