Spin-density-wave transition in double-layer nickelate La3Ni2O7
| Autor: | Dan, Zhao, Zhou, Yanbing, Huo, Mengwu, Wang, Yu, Nie, Linpeng, Wang, Meng, Wu, Tao, Chen, Xianhui |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Recently, a signature of high-temperature superconductivity above the liquid nitrogen temperature (77 K) was reported for La3Ni2O7 under pressure. This finding immediately stimulates intense interest in the possible high-Tc superconducting mechanism in double-layer nickelates. Interestingly, the pressure-dependent phase diagram inferred from transport measurements indicates that superconductivity under high pressure emerges from the suppression of a density-wave-like transition at ambient pressure, which is similar to high-temperature superconductors. Therefore, clarifying the exact nature of the density-wave-like transition is important for determining the mechanism of superconductivity in double-layer nickelates. Here, nuclear magnetic resonance (NMR) spectroscopy of 139La nuclei was performed to study the density-wave-like transition in a single crystal of La3Ni2O7. The temperature-dependent 139La NMR spectrum and nuclear spin-lattice relaxation rate (1/T1) provide unambiguous evidence for a spin-density-wave (SDW) transition with a transition temperature TSDW of ~ 150 K. Furthermore, the anisotropic splitting of the NMR spectrum suggests a possible double spin stripe with magnetic moments along the c axis. In addition, the present NMR measurements also revealed spatial inhomogeneity of magnetism due to inner apical oxygen vacancies. All these results will be helpful for building a connection between superconductivity and magnetic interactions in double-layer nickelates. Comment: 14 pages, 4 figures |
| Databáze: | arXiv |
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