P56.00007. Generalized Spin Fluctuation Feedback Effect and The Tale of Two Transitions

Presented by: Adil Amin


Experiments reveal that the superconductors UPt3, PrOs4Sb12 and U1-xThxBe13 undergo two superconducting transitions in the absence of an applied magnetic field. The prevalence of these multiple transitions suggests a common underlying mechanism. A natural candidate theory which accounts for these two transitions is the existence of a small symmetry breaking field, however such a field has not been observed in PrOs4Sb12 or U1-xThxBe13 and has been called into question for UPt3. Motivated by arguments originally developed for superfluid 3He we propose that a generalized spin fluctuation feedback effect is responsible for these two transitions. In this talk, we show that a phenomenological theory which couples spin fluctuations to superfluidity correctly predicts that a high temperature broken time-reversal superfluid 3He phase can emerge as a consequence. This phenomenological approach is then applied to these three superconductors revealing that this naturally leads to a high-temperature time-reversal invariant nematic superconducting phase, which can be followed by a second transition into a broken time-reversal symmetry phase, as observed.


  • Adil Amin
  • Daniel F. Agterberg


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