Volume 129, Number 2, January 2020
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 February 2020|
Spin-nematic order induced superconductivity
Department of Physics, University of Sofia - 1164 Sofia, Bulgaria
Received: 4 September 2019
Accepted: 27 January 2020
We explore a spin-fermion model with fermion-spin-quadrupolar interaction. In a nematic phase, this interaction reduces to a four-fermion interaction that is the basis of superconductivity. When the coupling constant is positive the superconductivity is a p-wave with spin-parallel–paired fermions. When it is negative the superconductivity is a p-wave and fermions are spin-antiparallel paired. For a system with zero chemical potential, even a very small coupling can bind fermions into a bound state that leads to superconductivity. When the chemical potential is non-zero the system possesses quantum critical transition from the normal spin-nematic phase to the phase where superconductivity coexists with spin-nematicity. The value of the quantum critical fermion-spin-nematicity coupling constant depends on the chemical potential.
PACS: 75.50.Bb – Fe and its alloys / 74.20.Mn – Nonconventional mechanisms / 74.20.Rp – Pairing symmetries (other than s-wave)
© EPLA, 2020
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