Andreev Spectroscopy of EuCsFe4As4 Stoichiometric Superconducting Pnictide

EuCsFe 4 As 4 pnictide (1144 family) single crystals with a critical temperature of T c ≈ 36.8 K and optimal superconducting properties in the stoichiometric composition are grown. Multiple-gap superconductivity determined by bulk order parameters , , and with characteristic ratios , , and , respect...

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Veröffentlicht in:	JETP letters 2022-11, Vol.116 (10), p.723-728
Hauptverfasser:	Kuzmichev, S. A., Pervakov, K. S., Vlasenko, V. A., Degtyarenko, A. Yu, Gavrilkin, S. Yu, Kuzmicheva, T. E.
Format:	Artikel
Sprache:	eng
Schlagworte:	Atomic Biological and Medical Physics Biophysics Condensed Matter Group 5A compounds Molecular Optical and Plasma Physics Order parameters Particle and Nuclear Physics Physics Physics and Astronomy Quantum Information Technology Single crystals Solid State Physics Spectroscopy Spintronics Stoichiometry Superconductivity
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Beschreibung
Zusammenfassung:	EuCsFe 4 As 4 pnictide (1144 family) single crystals with a critical temperature of T c ≈ 36.8 K and optimal superconducting properties in the stoichiometric composition are grown. Multiple-gap superconductivity determined by bulk order parameters , , and with characteristic ratios , , and , respectively, is found for the first time below T c using incoherent multiple Andreev reflection effect spectroscopy. It is shown that the gap structure of EuCsFe 4 As 4 is similar to that of BaFe 2 – x Ni x As 2 superconducting pnictides of the sister 122 family.
ISSN:	0021-3640 1090-6487
DOI:	10.1134/S0021364022602329