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arXiv 0903.1808cond-mat.supr-con
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金属铕的压力诱导超导电性

Pressure-Induced Superconductivity in Europium Metal

M. Debessai, T. Matsuoka, J. J. Hamlin, J. S. Schilling, K. Shimizu

摘要:

二价Eu(4f 7,J=7/2)具有强的局域磁矩,抑制了超导电性。在足够的压力下,预计Eu将变成三价(4f 6,J=0)和弱的Van Vleck顺磁体,从而为可能的超导态打开大门,类似于在0.79 K超导的Am金属(5 f6,J=0)。我们目前的交流磁化率和电阻率测量Eu金属的温度为1.5 - 297 K的压力高达142 GPa。在大约80 GPa下,Eu在Tc = 1.8 K时变成超导体; Tc随压力线性增加,在142 GPa时达到2.75 K。Eu金属因此成为周期表中第53个已知的元素超导体。

英文摘要:

Divalent Eu (4f7, J=7/2) possesses a strong local magnetic moment which suppresses superconductivity. Under sufficient pressure it is anticipated that Eu will become trivalent (4f6, J=0) and a weak Van Vleck paramagnet, thus opening the door for a possible superconducting state, in analogy with Am metal (5f6, J=0) which superconducts at 0.79 K. We present ac susceptibility and electrical resistivity measurements on Eu metal for temperatures 1.5 - 297 K to pressures as high as 142 GPa. At approximately 80 GPa Eu becomes superconducting at Tc = 1.8 K; Tc increases linearly with pressure to 2.75 K at 142 GPa. Eu metal thus becomes the 53rd known elemental superconductor in the periodic table.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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