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Impurity induced double transitions for accidentally degenerate unconventional pairing states

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arxiv 2009.10089 v1 pith:VFOW24AS submitted 2020-09-21 cond-mat.supr-con cond-mat.str-el

Bastian Zinkl , Manfred Sigrist This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords doubleimpuritypairingstatesunconventionalaccidentalaccidentallybehavior
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abstract

Non-magnetic impurities can lift the accidental degeneracy of unconventional pairing states, such as the $(d + i g)$-wave state recently proposed for Sr$_2$RuO$_4$. This type of effect would lead to a superconducting double transition upon impurity doping. In a model calculation it is shown how this behavior depends on material parameters and how it could be detected.

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