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An approach to identifying unconventional superconductivity in highly-compressed superconductors
Superconductor Science and Technology ( IF 3.7 ) Pub Date : 2020-10-29 , DOI: 10.1088/1361-6668/abb11a
E F Talantsev

Oxygen exhibits structural phase transformation from non-metallic $\epsilon$-O2 phase into metallic $\zeta$-O2 phase at pressure of P = 96 GPa (Desgreniers et al 1990 J. Phys. Chem. 94 1117; Akahama et al 1995 Phys. Rev. Lett. 74 4690). Metallic $\zeta$-O2 phase is a superconductor with transition temperature of Tc = 0.6 K at P = 115-120 GPa (Shimizu et al 1998 Nature 393 767). In this paper we have performed analysis of temperature dependent upper critical field, Bc2(T), for $\zeta$-O2 phase (P = 115 GPa) and show that this highly-compressed phase of gaseous molecular element is unconventional superconductor with the ratio of Tc to the Fermi temperature, Tf, in the range of 0.009 < Tc/Tf < 0.108.

中文翻译:

一种识别高度压缩超导体中非常规超导性的方法

在 P = 96 GPa 的压力下,氧气表现出从非金属 $\epsilon$-O2 相到金属 $\zeta$-O2 相的结构相变(Desgreniers 等人 1990 J. Phys. Chem. 94 1117;Akahama 等人 1995 Phys. Rev. Lett. 74 4690)。金属 $\zeta$-O2 相是一种超导体,转变温度为 Tc = 0.6 K,P = 115-120 GPa (Shimizu et al 1998 Nature 393 767)。在本文中,我们对 $\zeta$-O2 相 (P = 115 GPa) 的温度相关上临界场 Bc2(T) 进行了分析,并表明这种气态分子元素的高度压缩相是非常规超导体Tc 与费米温度 Tf 的比率在 0.009 < Tc/Tf < 0.108 的范围内。
更新日期:2020-10-29
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