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On the isotope effect in compressed superconducting H3S and D3S

机译：关于压缩超导H3S和D3s中的同位素效应

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摘要

A maximum superconductive transition temperature T-C - 203.5 K has recently been reported for a sample of the binary compound tri-hydrogen sulfide (H3S) prepared at high pressure and with room temperature annealing. Measurements of TC for H3S and its deuterium counterpart D3S have suggested a mass isotope effect exponent a with anomalous enhancements for reduced applied pressures. While widely cited for evidence of phonon-based superconductivity, the measured TC is shown to exhibit important dependences on the quality and character of the H3S and D3S materials under study; examination of resistance versus temperature data shows that variations in TC and apparent a are strongly correlated with residual resistance ratio, indicative of sensitivity to metallic order. Correlations also extend to the fractional widths of the superconducting transitions. Using resistance data to quantify and compensate for the evident materials differences between H3S and D3S samples, a value of alpha = 0.043 +/- 0.140 is obtained. Thus, when corrected for the varying levels of disorder, the experimental upper limit (<= 0.183) lies well below a derived in phonon-based theories.
机译：最近据报道了最大的超导转变温度T-C-203.5K用于高压下制备的二元化合物三氢硫化物（H3S）样品和室温退火。用于H3S及其氘代疗法D3的TC的测量表明，具有异常增强的质量同位素效应指数A，用于降低施加的压力。虽然广泛引用基于声子的超导性的证据，但是测量的Tc被证明表现出对在研究下的H3S和D3S材料的质量和特征的重要依赖性;抗性与温度数据的检查表明，TC和表观A的变化与残余电阻比强烈相关，指示对金属级的敏感性。相关性也延伸到超导转变的分数宽度。使用电阻数据量化和补偿H3S和D3S样品之间的明显材料差异，获得了α= 0.043 +/- 0.140的值。因此，当校正不同水平的无序水平时，实验上限（<= 0.183）位于基于声子的理论中的源于A以下。

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