Superconducting order parameter and bosonic mode in hydrogen-substituted NdFeAsO0.6H0.36 revealed by multiple-Andreev-reflection spectroscopy

Article

关键词: IRON-BASED SUPERCONDUCTORS;    RESONANCES;    GROWTH;   

DOI  :  10.1103/PhysRevB.100.144504

来源: SCIE

【 摘 要 】

Using intrinsic multiple-Andreev-reflection-effect spectroscopy, we studied ballistic superconductor-normal metal-superconductor (SnS) contacts in layered oxypnictide superconductors NdFeAsO(0.6)H(0.36 )with critical temperatures T-c = 45 - 48 K. We directly determined the magnitude of two bulk superconducting order parameters, the large gap Delta(L) approximate to 10.4 meV, a possible small gap Delta(S) approximate to 1.8 meV, and their temperature dependence. Additionally, a resonant coupling with a characteristic bosonic mode was observed-the boson energy at 4.2 K, epsilon(0) = 10.5 - 11.0 meV being less than the indirect gap (Delta(L) < epsilon(0) < Delta(L) + Delta(S)).

【 授权许可】

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