TY - JOUR
T1 - Time-reversal symmetry breaking superconductivity in the coexistence phase with magnetism in Fe pnictides
AU - Hinojosa, Alberto
AU - Fernandes, Rafael M.
AU - Chubukov, Andrey V.
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/10/13
Y1 - 2014/10/13
N2 - We argue that superconductivity in the coexistence region with spin-density-wave (SDW) order in weakly doped Fe pnictides erdiffers 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. We 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. We argue that time reversal may get broken even before true superconductivity develops.
AB - We argue that superconductivity in the coexistence region with spin-density-wave (SDW) order in weakly doped Fe pnictides erdiffers 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. We 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. We argue that time reversal may get broken even before true superconductivity develops.
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U2 - 10.1103/PhysRevLett.113.167001
DO - 10.1103/PhysRevLett.113.167001
M3 - Article
C2 - 25361274
AN - SCOPUS:84907934850
SN - 0031-9007
VL - 113
JO - Physical review letters
JF - Physical review letters
IS - 16
M1 - 167001
ER -