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Galluzzi A, Leo A, Masi A, Varsano F, Nigro A, Grimaldi G, Polichetti M. Critical Current and Pinning Features of a CaKFe 4As 4 Polycrystalline Sample. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6611. [PMID: 34772137 PMCID: PMC8585420 DOI: 10.3390/ma14216611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 12/03/2022]
Abstract
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.
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Affiliation(s)
- Armando Galluzzi
- Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy; (A.L.); (A.N.)
- CNR-SPIN Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy;
| | - Antonio Leo
- Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy; (A.L.); (A.N.)
- CNR-SPIN Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy;
| | - Andrea Masi
- ENEA, Via Anguillarese 301, I-00123 Roma, Italy; (A.M.); (F.V.)
- Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via Vito Volterra 62, I-00146 Roma, Italy
| | | | - Angela Nigro
- Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy; (A.L.); (A.N.)
- CNR-SPIN Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy;
| | - Gaia Grimaldi
- CNR-SPIN Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy;
| | - Massimiliano Polichetti
- Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy; (A.L.); (A.N.)
- CNR-SPIN Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084 Salerno, Italy;
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