Antiferromagnetic Spin Fluctuations and Unconventional Superconductivity in Topological Superconductor Candidate YPtBi Revealed by Pt195-NMR
Y. Z. Zhou, J. Chen, Z. X. Li, J. Luo, J. Yang, Y. F. Guo, W. H. Wang, R. Zhou, Guo-qing Zheng
DOI 10.1103/PhysRevLett.130.266002 · Physical Review Letters
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Abstract
We report Pt195 nuclear magnetic resonance (NMR) measurements on topological superconductor candidate YPtBi, which has broken inversion symmetry and topological nontrivial band structures due to the strong spin-orbit coupling. In the normal state, we find that Knight shift K is field- and temperature independent, suggesting that the contribution from the topological bands is very small at low temperatures. However, the spin-lattice relaxation rate 1/T1 divided by temperature (T), 1/T1T, increases with decreasing T, implying the existence of antiferromagnetic spin fluctuations. In the superconducting state, no Hebel-Slichter coherence peak is seen below Tc and 1/T1 follows T3 variation, indicating the unconventional superconductivity. The finite spin susceptibility at zero-temperature limit and the anomalous increase of the NMR linewidth below Tc point to a mixed state of spin-singlet and spin-triplet (or spin-septet) pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YPtBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.77 | Pressure not reported | unknown |
| YPtBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.77 | Pressure not reported | unknown |
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