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Tunable quantum critical point and detached superconductivity in Al-doped CrAs
npj Quantum Materials ( IF 5.7 ) Pub Date : 2019-09-05 , DOI: 10.1038/s41535-019-0188-6
Sungmin Park , Soohyeon Shin , Sung-Il Kim , Suyoung Kim , Chan-Koo Park , Joe D. Thompson , Tuson Park

The origin of unconventional superconductivity and its relationship to a T = 0 K quantum critical point (QCP), which is hidden inside the dome of a superconducting state, have long been an outstanding puzzle in strongly correlated superconductors. The observation and tuning of the hidden QCP, which is key to resolving the mystery, however, has been rarely reported. Here we report the controlling of a hidden QCP in the helical antiferromagnet CrAs and separation of the tuned QCP from the pressure-induced superconducting phase. The Al doping in CrAs increases the antiferromagnetic ordering temperature TN from 265 to 275 K, while it suppresses the QCP from 8 to 4.5 kbar. Pressure-induced superconductivity in the high-pressure regime is almost independent of Al doping, but superconductivity below 6 kbar is suppressed, revealing the clear separation between the tuned antiferromagnetic QCP and Tc maximum. These discoveries illustrate subtleties in the interplay between superconductivity and quantum criticality and warrant a deeper insight in understanding of unconventional superconductivity.



中文翻译:

铝掺杂CrAs中的可调量子临界点和超导电性

 长期以来,非常规超导的起源及其与T = 0 K量子临界点(QCP)的关系一直隐藏在超相关状态的超导体中,而TCP量子临界点(QCP)隐藏在超导状态的穹顶内。然而,鲜为人知的是,隐藏QCP的观察和调整是解决这个谜团的关键。在这里,我们报告了螺旋反铁磁体CrAs中隐藏的QCP的控制以及从压力感应的超导相中分离出已调谐的QCP。CrAs中的Al掺杂会增加反铁磁有序温度T N265至275 K,而QCP抑制为8至4.5 kbar。高压条件下的压力感应超导几乎与Al掺杂无关,但低于6 kbar的超导被抑制,这表明调谐的反铁磁QCP与T c最大值之间存在清晰的分隔。这些发现说明了超导性和量子临界性之间相互作用的微妙之处,并为理解非常规超导性提供了更深刻的见解。

更新日期:2019-09-05
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