We report the results of ⁷⁷Se--nuclear magnetic resonance (NMR) in α-FeSe, which exhibits a similar crystal structure to the LaFeAsO₁₋ₓFₓ superconductor and shows superconductivity at 8 K. The nuclear-spin lattice relaxation rate 1/T₁ shows T³ behavior below the superconducting transition temperature Tc without a coherence peak. The T₁T= const. behavior, indicative of the Fermi liquid state, can be seen in a wide temperature range above Tc. The superconductivity in α-FeSe is also an unconventional one as well as LaFeAsO₁₋ₓFₓ and related materials. The FeAs layer is not essential for the occurrence of the unconventional superconductivity.
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Kotegawa et al. (2008) studied this question.
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