Sixfold enhancement of superconductivity in a tunable electronic nematic system
Sixfold enhancement of superconductivity in a tunable electronic nematic system
复制标题
DOI：
10.1038/s41567-019-0736-9
复制
发表时间：
2020
期刊：
影响因子：
19.6
通讯作者：
Paglione J
中科院分区：
文献类型：
--
作者：
Eckberg C;Campbell DJ;Metz T;Collini J;Hodovanets H;Drye T;Zavalij P;Christensen MH;Fernandes RM;Lee S;Abbamonte P;Lynn JW;Paglione J
在高温超导体中，电子自由度降低了晶体的转动自由度，这一现象通常被观察到。然而，理解向列性和磁涨落在库珀配对中的作用往往由于其他有序的共存而变得更加复杂，特别是长程磁有序。在这里，我们报告的增强超导性的模型电子超导系统，是没有磁性的，并表明，增强是直接出生的强超导波动与量子相变。我们目前的电阻作为应变的函数在Ba 1-xSrxNi 2As 2的测量表明，锶取代促进电子驱动的有序在这个系统中。此外，该命令的绝对零度温度的完全抑制导致对强度的增强，证明了在超导转变温度的六倍增加。在这个模型系统中，增强配对和电子涨落之间的直接关系，以及与单向电荷密度波序的相互作用，可与铜酸盐中发现的相媲美，提供了一种手段来研究向列性在加强超导性中的作用。
The electronic nematic phase—in which electronic degrees of freedom lower the crystal rotational symmetry—is commonly observed in high-temperature superconductors. However, understanding the role of nematicity and nematic fluctuations in Cooper pairing is often made more complicated by the coexistence of other orders, particularly long-range magnetic order. Here we report the enhancement of superconductivity in a model electronic nematic system that is not magnetic, and show that the enhancement is directly born out of strong nematic fluctuations associated with a quantum phase transition. We present measurements of the resistance as a function of strain in Ba1–xSrxNi2As2 to show that strontium substitution promotes an electronically driven nematic order in this system. In addition, the complete suppression of that order to absolute zero temperature leads to an enhancement of the pairing strength, as evidenced by a sixfold increase in the superconducting transition temperature. The direct relation between enhanced pairing and nematic fluctuations in this model system, as well as the interplay with a unidirectional charge-density-wave order comparable to that found in the cuprates, offers a means to investigate the role of nematicity in strengthening superconductivity.
登录
查看更多内容
DOI：
10.1073/pnas.1406019111
发表时间：
2014-06-03
影响因子：
11.1
作者：
Nie, Laimei;Tarjus, Gilles;Kivelson, Steven Allan
通讯作者：
Kivelson, Steven Allan
影响因子：
8.6
作者：
Lee, Sangjun;de la Pena, Gilberto;Abbamonte, Peter
通讯作者：
Abbamonte, Peter
DOI：
10.1073/pnas.1620651114
发表时间：
2017-05-09
影响因子：
11.1
作者：
Lederer, Samuel;Schattner, Yoni;Kivelson, Steven A.
通讯作者：
Kivelson, Steven A.
影响因子：
8.6
作者：
Fernandes, Rafael M.;Boehmer, Anna E.;Schmalian, Joerg
通讯作者：
Schmalian, Joerg
影响因子：
8.6
作者：
Kang, Jian;Fernandes, Rafael M.
通讯作者：
Fernandes, Rafael M.