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arXiv 1708.05973cond-mat.supr-con
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超导掺杂拓扑绝缘体Nb $_{0.25}$ Bi $_2$ Se $_3$中$T_c$在hydrostatic pressure下的增加

An increase in $T_c$ under hydrostatic pressure in the superconducting doped topological insulator Nb$_{0.25}$Bi$_2$Se$_3$

M. P. Smylie, K. Willa, K. Ryan, H. Claus, W. -K. Kwok, Y. Qiu, Y. S. Hor, U. Welp

摘要:

我们报告了一个意想不到的正流体静压导数的超导转变温度的掺杂拓扑绝缘体\NBS通过$dc$ SQUID磁强计在压力高达0.6 GPa。该结果与关于同系物\CBS和\SBS的报道相反,其中观察到$T_c$的平稳抑制。我们的结果是一致的,最近的Ginzburg-Landau理论预测的压力诱导增强的$T_c$的多组分$E_u$状态提出来解释观察到的掺杂Bi $_2$ Se $_3$超导体的旋转对称性破缺。

英文摘要:

We report an unexpected positive hydrostatic pressure derivative of the superconducting transition temperature in the doped topological insulator \NBS via $dc$ SQUID magnetometry in pressures up to 0.6 GPa. This result is contrary to reports on the homologues \CBS and \SBS where smooth suppression of $T_c$ is observed. Our results are consistent with recent Ginzburg-Landau theory predictions of a pressure-induced enhancement of $T_c$ in the nematic multicomponent $E_u$ state proposed to explain observations of rotational symmetry breaking in doped Bi$_2$Se$_3$ superconductors.

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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