Article
Temperature dependence of bulk and intergrain critical current in perspective iron-based superconductor CaKFe4As4
S. A. Kuzmichev
Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 1, 119991 Moscow, Russia
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
e-mail: kuzmichev@lt.phys.msu.ru
T. E. Kuzmicheva
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
A. D. Lomonosova
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
Moscow Institute of Physics and Technology, Institutsky pereulok, 9, 141701 Dolgoprudny, Russia
I. A. Nikitchenkov
Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 1, 119991 Moscow, Russia
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
V. A. Vlasenko
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
A. S. Medvedev
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
K. S. Pervakov
Lebedev Physical Institute of the RAS, Leninsky prospect, 53, 119991 Moscow, Russia
DOI: https://doi.org/10.62539/2949-5644-2025-9-4-25-37
Abstract
Using tunneling spectroscopy of break-junctions in polycrystalline samples of CaKFe4As4 iron pnictide with Tc approx 35–36 K, we have studied the temperature dependence of critical supercurrent Ic(T) in zero magnetic field. Temperature dependences of intergrain IcGB(T) and bulk supercurrent Icbulk(T) (corresponding to the Cooper pair concentration of the superconductor) are measured.
Keywords: iron-based superconductors, critical current, tunneling spectroscopy, superconducting order parameter.
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