| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Emergence of High-Temperature Superconducting Phase in Pressurized La$_{3}$Ni$_{2}$O$_7$ Crystals |
| Jun Hou1,2†, Peng-Tao Yang1,2†, Zi-Yi Liu1,2†, Jing-Yuan Li3†, Peng-Fei Shan1,2, Liang Ma1,4,5, Gang Wang1,2, Ning-Ning Wang1,2, Hai-Zhong Guo4,5, Jian-Ping Sun1,2, Yoshiya Uwatoko6, Meng Wang3*, Guang-Ming Zhang7*, Bo-Sen Wang1,2*, and Jin-Guang Cheng1,2* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
4Key Laboratory of Materials Physics (Ministry of Education), School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
5Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
6Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
7State Key Laboratory for Low dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
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| Cite this article: |
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Jun Hou, Peng-Tao Yang, Zi-Yi Liu et al 2023 Chin. Phys. Lett. 40 117302 |
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Abstract The recent report of pressure-induced structural transition and signature of superconductivity with $T_{\rm c}\approx80$ K above 14 GPa in La$_{3}$Ni$_{2}$O$_{7}$ crystals has garnered considerable attention. To further elaborate this discovery, we carried out comprehensive resistance measurements on La$_{3}$Ni$_{2}$O$_{7}$ crystals grown in an optical-image floating zone furnace under oxygen pressure (15 bar) using a diamond anvil cell (DAC) and cubic anvil cell (CAC), which employ a solid (KBr) and liquid (glycerol) pressure-transmitting medium, respectively. Sample 1 measured in the DAC exhibits a semiconducting-like behavior with large resistance at low pressures and gradually becomes metallic upon compression. At pressures $P \geqslant13.7$ GPa we observed the appearance of a resistance drop of as much as $\sim$ 50% around 70 K, which evolves into a kink-like anomaly at pressures above 40 GPa and shifts to lower temperatures gradually with increasing magnetic field. These observations are consistent with the recent report mentioned above. On the other hand, sample 2 measured in the CAC retains metallic behavior in the investigated pressure range up to 15 GPa. The hump-like anomaly in resistance around $\sim$ 130 K at ambient pressure disappears at $P\geqslant2$ GPa. In the pressure range of 11–15 GPa we observed the gradual development of a shoulder-like anomaly in resistance at low temperatures, which evolves into a pronounced drop of resistance of 98% below 62 K at 15 GPa, reaching a temperature-independent resistance of 20 $µ \Omega$ below 20 K. Similarly, this resistance anomaly can be progressively shifted to lower temperatures by applying external magnetic fields, resembling a typical superconducting transition. Measurements on sample 3 in the CAC reproduce the resistance drop at pressures above 10 GPa and realize zero resistance below 10 K at 15 GPa even though an unusual semiconducting-like behavior is retained in the normal state. Based on these results, we constructed a dome-shaped superconducting phase diagram and discuss some issues regarding the sample-dependent behaviors on pressure-induced high-temperature superconductivity in the La$_{3}$Ni$_{2}$O$_{7}$ crystals.
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Received: 28 September 2023
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Published: 16 October 2023
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.62.Fj
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(Effects of pressure)
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74.25.Dw
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(Superconductivity phase diagrams)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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