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Evidence for superconductivity in Rb metal above 55 GPa pressure

机译:高于55 GPa压力的Rb金属超导性的证据

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摘要

The only alkali metal known to be superconducting at ambient pressure is Li at 0.4 mK. Under 30 GPa pressure T-c for Li rises to 14 K. In addition, nearly 50 years ago the heavy alkali metal Cs was reported to become superconducting near 1.3 K at 12 GPa. In the present experiment the superconductivity of Cs under pressure is confirmed. In addition, strong evidence is presented in electrical resistivity measurements that neighboring Rb also becomes superconducting near 2 K at 55 GPa as it enters the oC16 phase, as for Cs, where T-c decreases under the application of pressure. It would seem likely that under the right temperature/pressure conditions all alkali metals, including metallic hydrogen, will join the ranks of the superconducting elements. With the addition of Rb, 55 of the 92 naturally occurring elements are superconducting at ambient or high pressure.
机译:已知在环境压力下超导的唯一碱金属是0.4 mK的Li。在30 GPa的压力下,Li的T-c升高至14K。此外,近50年前,据报道,重碱金属Cs在12 GPa时在1.3 K附近变得超导。在本实验中,确定了Cs在压力下的超导性。此外,在电阻率测量中有强有力的证据表明,相邻的Rb进入oC16相时,在55 GPa下在2 K附近也变得超导,就Cs而言,在施加压力时T-c降低。在适当的温度/压力条件下,所有碱金属,包括金属氢,似乎都将加入超导元素的行列。通过添加Rb,这92种天然元素中的55种在环境或高压下是超导的。

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  • 来源
    《Physical review》 |2019年第4期|041109.1-041109.5|共5页
  • 作者单位

    Washington Univ, Dept Phys, St Louis, MO 63130 USA;

    Washington Univ, Dept Phys, St Louis, MO 63130 USA;

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