Enhanced critical temperatures in the strongly overdoped iron-based superconductors AFe2As2 (A = K, Cs, Rb) observed by point contacts

A remarkable several times increase (up to 10 K) of the superconducting critical temperature Tc has been observed in point contacts created on the base of single crystals AFe2As2 (A = K, Cs, Rb). Possible reasons for such a Tc increase in point contacts are briefly discussed on a qualitative level....

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2020-11, Vol.46 (11), p.1070-1073
Main Authors: Naidyuk, Yu. G., Kvitnitskaya, O. E., Efremov, D. V., Drechsler, S.-L.
Format: Article
Language:English
Subjects:
Cesium
Contact pressure
Critical temperature
Rubidium
Single crystals
Superconductors
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Summary:A remarkable several times increase (up to 10 K) of the superconducting critical temperature Tc has been observed in point contacts created on the base of single crystals AFe2As2 (A = K, Cs, Rb). Possible reasons for such a Tc increase in point contacts are briefly discussed on a qualitative level. Among them, it is most likely attributed to interfacial carrier doping and/or uniaxial non-homogeneous pressure arising when the contact is created.
ISSN:1063-777X
1090-6517
DOI:10.1063/10.0002149