Critical Current and Pinning Features of a CaKFe4As4 Polycrystalline Sample

We analyze the magnetic behavior of a CaKFe4As4 polycrystalline sample fabricated by a mechanochemically assisted synthesis route. By means of DC magnetization (M) measurements as a function of the temperature (T) and DC magnetic field (H) we study its critical parameters and pinning features. The c...

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Bibliographic Details
Published in:Materials 2021-11, Vol.14 (21), p.6611
Main Authors: Galluzzi, Armando, Leo, Antonio, Masi, Andrea, Varsano, Francesca, Nigro, Angela, Grimaldi, Gaia, Polichetti, Massimiliano
Format: Article
Language:English
Subjects:
Cooling
Cooling curves
Critical current density
Critical temperature
Defects
Hysteresis loops
Magnetic fields
Magnetic properties
Pinning
Polycrystals
Single crystals
Temperature dependence
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Summary:We analyze the magnetic behavior of a CaKFe4As4 polycrystalline sample fabricated by a mechanochemically assisted synthesis route. By means of DC magnetization (M) measurements as a function of the temperature (T) and DC magnetic field (H) we study its critical parameters and pinning features. The critical temperature Tc has been evaluated by M(T) curves performed in Zero Field Cooling-Field Cooling conditions. These curves show the presence of a little magnetic background for temperatures above Tc, as also confirmed by the hysteresis loops M(H). Starting from the M(H) curves, the critical current density Jc of the sample has been calculated as a function of the field at different temperatures in the framework of the Bean critical state model. The Jc(H) values are in line with the ones reported in the literature for this typology of samples. By analyzing the temperature dependence of the critical current density Jc(T) at different magnetic fields, it has been found that the sample is characterized by a strong type pinning regime. This sample peculiarity can open perspectives for future improvement in the fabrication of this material.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14216611