Fizika Nizkikh Temperatur: Volume 46, Number 11 (November 2020), p. 1261-1265    ( to contents , go back )

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

Yu. G. Naidyuk1, O. E. Kvitnitskaya1, D. V. Efremov2, and S.-L. Drechsler3

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine

2Institute for Solid State Research, IFW Dresden, Dresden D-01171, Germany

3Institute for Theoretical Solid State Physics, IFW Dresden, Dresden D-01171, Germany
pos Анотація:

Received June 29, 2020, published online September 21, 2020

Abstract

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.

Key words: iron-based superconductors, superconducting critical temperature, point contacts.

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