Report
Antiferromagnetic spin fluctuations and unconventional superconductivity in topological superconductor candidate YPtBi revealed by $^{195}$Pt-NMR
| العنوان: | Antiferromagnetic spin fluctuations and unconventional superconductivity in topological superconductor candidate YPtBi revealed by $^{195}$Pt-NMR |
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| المؤلفون: | Zhou, Y. Z., Chen, J., Li, Z. X., Luo, J., Yang, J., Guo, Y. F., Wang, W. H., Zhou, R., Zheng, Guo-qing |
| المصدر: | Physical Review Letters 130, 266002 (2023) |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We report $^{195}$Pt nuclear magnetic resonance (NMR) measurements on topological superconductor candidate YPtBi which has the broken inversion symmetry and topological non-trivial band structures due to the strong spin-orbit coupling(SOC). 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/$T_1$ divided by temperature ($T$), 1/$T_1T$, increases with decreasing $T$, implying the existence of antiferromagnetic spin fluctuations. In the superconducting state, no Hebel-Slichter coherence peak is seen below $T_{\rm c}$ and 1/$T_1$ follows $T^{3}$ variation, indicating the unconventional superconductivity. The finite spin susceptibility at zero-temperature limit and the anomalous increase of the NMR line width below $T_{\rm c}$ point to a mixed state of spin-singlet and spin-triplet(or spin-septet) pairing. Comment: 13 pages, 5 figures, accepted for publication in Physical Review Letters |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.130.266002 |
| URL الوصول: | http://arxiv.org/abs/2305.09437 |
| رقم الانضمام: | edsarx.2305.09437 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.130.266002 |
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