Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Characterization of Near-Room-Temperature Superconductivity in Yttrium Superhydrides

Version 1 : Received: 23 December 2019 / Approved: 24 December 2019 / Online: 24 December 2019 (08:47:09 CET)

How to cite: Talantsev, E. Characterization of Near-Room-Temperature Superconductivity in Yttrium Superhydrides. Preprints 2019, 2019120313 (doi: 10.20944/preprints201912.0313.v1). Talantsev, E. Characterization of Near-Room-Temperature Superconductivity in Yttrium Superhydrides. Preprints 2019, 2019120313 (doi: 10.20944/preprints201912.0313.v1).

Abstract

Recently, Troyan et al (2019 arXiv:1908.01534) and Kong et al (2019 arXiv:1909.10482) extended near-room-temperature superconductors family by new yttrium superhydride polymorphs, YHn (n = 4,6,7,9), which exhibit superconducting transition temperatures in the range of Tc = 210-243 K at pressure of P = 160-255 GPa. In this paper, temperature dependent upper critical field data, Bc2(T), for highly-compressed mixture of YH4+YH6 phases (reported by Kong et al 2019 arXiv:1909.10482) is analysed to deduce the ratio of Tc to the Fermi temperature, TF. Our analysis shows that in all considered scenarios the YH4+YH6 mixture has the ratio 0.01 ≤ Tc/TF ≤ 0.04. As the result, YH4+YH6 falls in the unconventional superconductors band in the Uemura plot. It is also found that the characteristic temperature of the order parameter amplitude fluctuations, Tfluc, in the YH4+YH6 mixture is only several percent above observed Tc, and thus the superconducting transition in yttrium superhydride polymorphs is fundamentally limited by thermodynamics fluctuations.

Subject Areas

near-room-temperature superconductivity; hydride superconductors; yttrium superhydrides

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