Coexistence of isotropic s-wave and extended s-wave order parameters in
FeSe as revealed by the low-temperature specific heat
release_4he2uj6mcbf2dc4mvb3qltk2bi
by
J.-Y. Lin, Y. S. Hsieh, D. A. Chareev, A. N. Vasiliev, Y. Parsons, and
H. D. Yang
2011
Abstract
The comprehensive low-temperature specific heat C(T) data identify both an
isotropic s-wave and an extended s-wave order parameters coexisting in a
superconducting single crystal FeSe with Tc=8.11 K. The isotropic gap
Δ0=1.33 meV on the hole Fermi sheets and the extended s-wave gap
Δ=Δe(1+αcos2_theta) with Δe=1.13 meV and α=0.78
on the electron Fermi sheets. The extended s-wave is rather anisotropic but the
low energy quasiparticle excitations demonstrate no sign of the accidental
nodes. The coefficient γ(H) manifesting the quasiparticle contribution to
C is a non-linear function of the applied magnetic field H in the mixed state
in accord with the anisotropic multi-order parameters.
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