We report the 75As nuclear quadrupole resonance (NQR) and specific heat measurements of the heavily hole-doped superconductor KFe 2As 2 (superconducting transition temperature T c 3.5 K). The spin-lattice relaxation rate 1/T 1 in the superconducting state exhibits a gradual temperature dependence with no coherence peak below T c. The quasiparticle specific heat C qp/T shows a small jump, which is about 30% of the electronic specific heat coefficient just below T c. The C qp/T suggests the existence of low-energy quasiparticle excitation at the lowest measurement temperature T - 0.4 K T c/10. The T dependences of 1/T 1 and C qp/T can be explained by a multiple nodal superconducting gap scenario rather than by a multiple fully gapped s ±-wave scenario determined using simple gap analysis. © 2009 The Physical Society of Japan.
CITATION STYLE
Fukazawa, H., Yamada, Y., Kondo, K., Saito, T., Kohori, Y., Kuga, K., … Eisaki, H. (2009). Possible multiple gap superconductivity with line nodes in heavily hole-doped superconductor KFe 2As 2 studied by 75As nuclear quadrupole resonance and specific heat. Journal of the Physical Society of Japan, 78(8). https://doi.org/10.1143/JPSJ.78.083712
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