s-wave superconductivity in superconducting BaTi2Sb2O revealed by 121/123Sb-NMR/nuclear quadrupole resonance measurements
S. Kitagawa, K. Ishida, K. Nakano, T. Yajima, H. Kageyama
DOI 10.1103/PhysRevB.87.060510 · 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 the 121/123Sb-NMR/nuclear quadrupole resonance (NQR) measurements on the superconductor BaTi2Sb2O with a two-dimensional Ti2O square-net layer formed with Ti3+ (3d1). NQR measurements revealed that the in-plane four-fold symmetry is broken at the Sb site below TA∼40 K, without an internal field appearing at the Sb site. These exclude a spin-density wave (SDW)/ charge density wave (CDW) ordering with incommensurate correlations, but can be understood with the commensurate CDW ordering at TA. The spin-lattice relaxation rate 1/T1, measured at the four-fold symmetry breaking site, decreases below superconducting (SC) transition temperature Tc, indicative of the microscopic coexistence of superconductivity and the CDW/SDW phase below TA. Furthermore, 1/T1 of 121Sb-NQR shows a coherence peak just below Tc and decreases exponentially at low temperatures. These results are in sharp contrast with those in cuprate and iron-based superconductors, and strongly suggest that its SC symmetry is classified to an ordinary s-wave state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.95 | Pressure not reported | onset |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
Similar papers
Orbital magnetic dynamics in chiral p-wave superconductors
similarity 0.96V. Braude & E. B. Sonin
Source status unknown — claims are unverified
Evidence for Strong-Coupling s-Wave Superconductivity in MgB2: B11 NMR Study
similarity 0.96H. Kotegawa et al.
Source status unknown — claims are unverified
Single-Gap s-Wave Superconductivity near the Charge-Density-Wave Quantum Critical Point in CuxTiSe2
similarity 0.96S. Y. Li et al.
Source status unknown — claims are unverified
Intrinsic spin-orbit coupling in superconducting δ-doped SrTiO3 heterostructures
similarity 0.96M. Kim et al.
Source status unknown — claims are unverified
Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS2 in the two-dimensional limit
similarity 0.96Yafang Yang et al.
Source status unknown — claims are unverified
Spectroscopic and optical response of odd-frequency superconductors
similarity 0.96P. O. Sukhachov & A. V. Balatsky
Source status unknown — claims are unverified