University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, December 14th 2016
4:30 pm:
CM Journal Club in PAN 110
Speaker: Alberto Alvarado
Subject: Time-reversal symmetry breaking superconductivity in the coexistence phase with magnetism of Fe-pnictides

I argue that superconductivity in the coexistence region with spin-density-wave (SDW) order in weakly doped Fe pnictides differs qualitatively from the ordinary s+− state outside the coexistence region as it develops an additional gap component which is a mixture of intrapocket singlet (s++) and interpocket spin-triplet pairings (the t state). The coupling constant for the t channel is proportional to the SDW order and involves interactions that do not contribute to superconductivity outside of the SDW region. I argue that the s+− and t-type superconducting orders coexist at low temperatures, and the relative phase between the two is, in general, different from 0 or π, manifesting explicitly the breaking of the time-reversal symmetry promoted by long-range SDW order.

Reference: A. Hinojosa, R. M. Fernandes, and A. V. Chubukov. Phys. Rev. Lett. 113, 167001 (2014).

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