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Unconventional thermoelectric effect in superconductors that break time-reversal symmetry | | Mihail Silaev
; Julien Garaud
; Egor Babaev
; | | Date: |
6 Mar 2015 | | Abstract: | Thermoelectric effects in superconductors, and their fundamental importance,
were first discussed 70 years ago by Ginzburg. These effects originate in
charge transfer by thermal quasiparticles, which is compensated by the
counterflow of superconducting current $ {f j_s}=-b_n{oldsymbol
abla} T$
(where $b_n$ is the normal component thermoelectric coefficient). As it is
determined by the dissipative normal current, the direction of the thermally
induced supercurrent is time-reversal invariant. We point out here, that
multicomponent superconductors which break time-reversal symmetry, have
entirely different thermoelectric properties. Namely, there is a generic
contribution to the thermally induced supercurrent, whose direction is not
invariant under time-reversal operation. Besides, that contribution can be
orders of magnitude larger than the ordinary one and, in contrast to the
Ginzburg’s mechanism, be present even at low temperatures. To illustrate this
new effect, we consider the $s+is$ state, that breaks time-reversal symmetry,
and is widely expected to be realized in pnictide compounds
Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ and stoichiometric LiFeAs. | | Source: | arXiv, 1503.2024 | | Services: | Forum | Review | PDF | Favorites | |
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