Pressure-induced superconducting state in crystalline boron nanowires
Liling Sun, Takahiro Matsuoka, Yasuyuki Tamari, Katsuya Shimizu, Jifa Tian, Yuan Tian, Chendong Zhang, Chengmin Shen, Wei Yi, Hongjun Gao, Jianqi Li, Xiaoli Dong, Zhongxian Zhao
DOI 10.1103/PhysRevB.79.140505 · Physical Review B
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Abstract
We report high-pressure induced superconductivity in boron nanowires (BNWs) with rhombohedral crystal structure. Obviously different from bulk rhombohedral boron (β−r-B), these BNWs show a semiconductor-metal transition at much lower pressure than bulk β−r-B. Also, we found that these BNWs become superconductors with Tc=1.5 K at 84 GPa, at the pressure of which bulk β−r-B is still a semiconductor, via in situ resistance measurements in a diamond-anvil cell. With increasing pressure, Tc of the BNWs increases. The occurrence of superconductivity in the BNWs at a pressure as low as 84 GPa probably arises from the size effect.
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