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Abstract <p>Miassite (rhodium sulfide Rh<sub>17</sub>S<sub>15</sub>) is the mineral with the highest superconducting transition temperature <i>T</i><sub>c</sub> = 5.5 K among other minerals. Laboratory-grown Rh<sub>17</sub>S<sub>15</sub> phase has been studied by several groups, but the superconductivity in Rh<sub>17</sub>S<sub>15</sub> is still not fully understood. Recently, Xu et al. [10] reported that the <i>T</i><sub>c</sub> in Rh<sub>17</sub>S<sub>15</sub> at pressure range 2.5 GPa &lt; <i>P</i> &lt; 60 GPa is suppressed below 2.5 K. However, at pressure above <i>P</i> &gt; 60 GPa the superconducting state reentrants and the highest transition temperature of <i>T</i><sub>c</sub> = 5 K was observed at <i>P</i> = 117.7 GPa. Here, the reported experimental temperature and magnetic field dependences of the resistance <i>R</i>(<i>T</i>, <i>P</i>, <i>B</i>) in highly compressed Rh<sub>17</sub>S<sub>15</sub> were analyzed. As a result, I found that the ratio of the superconducting transition temperature, <i>T</i><sub>c</sub>, to the Fermi temperature, <i>T</i><sub>F</sub>, in Rh<sub>17</sub>S<sub>15</sub> at <i>P</i> = 110 GPa is <i>T</i><sub>c</sub>/<i>T</i><sub>F</sub>&#xa0;= 0.150–0.167 that is surprisingly close to the Bose–Einstein condensate ratio <i>T</i><sub>c</sub>/<i>T</i><sub>F</sub> = 0.176.</p>

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Highly Compressed Miassite Rh17S15: A Bose–Einstein Condensate Superconductor?

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • E. F. Talantsev

摘要

Abstract

Miassite (rhodium sulfide Rh17S15) is the mineral with the highest superconducting transition temperature Tc = 5.5 K among other minerals. Laboratory-grown Rh17S15 phase has been studied by several groups, but the superconductivity in Rh17S15 is still not fully understood. Recently, Xu et al. [10] reported that the Tc in Rh17S15 at pressure range 2.5 GPa < P < 60 GPa is suppressed below 2.5 K. However, at pressure above P > 60 GPa the superconducting state reentrants and the highest transition temperature of Tc = 5 K was observed at P = 117.7 GPa. Here, the reported experimental temperature and magnetic field dependences of the resistance R(T, P, B) in highly compressed Rh17S15 were analyzed. As a result, I found that the ratio of the superconducting transition temperature, Tc, to the Fermi temperature, TF, in Rh17S15 at P = 110 GPa is Tc/TF = 0.150–0.167 that is surprisingly close to the Bose–Einstein condensate ratio Tc/TF = 0.176.