期刊
PHYSICAL REVIEW B
卷 84, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.220507
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资金
- National Science Council of Taiwan, ROC [NSC98-2112-009-005-MY3, NSC100-2112-M110-004-MY3]
- President of the Russian Federation [MK-1557.2011.5]
- Russian Ministry of Science and Education [11.519.11.6012]
- Russian Foundation for Basic Research [11-519-11-6012, 10-02-90409, 10-02-00021]
The comprehensive low-temperature specific-heat C(T) data identify both an isotropic s-wave and extended s-wave order parameters coexisting in a superconducting single-crystal FeSe with T-c = 8.11 K. The isotropic gap Delta(0) = 1.33 meV on the hole Fermi sheets and the extended s-wave gap Delta = Delta(e)(1+ alpha cos2 phi) with Delta(e) = 1.13 meV and alpha = 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 gamma(H) manifesting the quasiparticle contribution to C is a nonlinear function of the applied magnetic field H in the mixed state in accord with the anisotropic multiorder parameters.
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