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10.3390/ma14185214
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Article

High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon

by
Armando Galluzzi
1,2,*,
Krastyo Buchkov
3,4,
Vihren Tomov
3,
Elena Nazarova
3,
Antonio Leo
1,2,
Gaia Grimaldi
2 and
Massimiliano Polichetti
1,2,*
1
Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy
2
CNR-SPIN Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy
3
Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
4
Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 109, 1113 Sofia, Bulgaria
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(18), 5214; https://doi.org/10.3390/ma14185214
Submission received: 26 July 2021 / Revised: 2 September 2021 / Accepted: 7 September 2021 / Published: 10 September 2021
(This article belongs to the Special Issue Synthesis, Design, Characterization of Unconventional Superconducting Materials)
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Abstract

The magnetization M of an Fe(Se, Te) single crystal has been measured as a function of temperature T and dc magnetic field H. The sample properties have been analyzed in the case of a magnetic field parallel to its largest face H||ab. From the M(T) measurement, the Tc of the sample and a magnetic background have been revealed. The superconducting hysteresis loops M(H) were between 2.5 K and 15 K showing a tilt due to the presence of a magnetic signal measured at T > Tc. From the M(H) curves, the critical current density Jc(H) has been extracted at different temperatures showing the presence of a second magnetization peak phenomenon. By extracting and fitting the Jc(T) curves at different fields, a pinning regime crossover has been identified and shown to be responsible for the origin of the second magnetization peak phenomenon. Then, the different kinds of pinning centers of the sample were investigated by means of Dew-Hughes analysis, showing that the pinning mechanism in the sample can be described in the framework of the collective pinning theory. Finally, the values of the pinning force density have been calculated at different temperatures and compared with the literature in order to understand if the sample is promising for high-current and high-power applications.
Keywords: iron-based superconductors; dc magnetic properties; second magnetization peak phenomenon; pinning force; magnetism and superconductivity iron-based superconductors; dc magnetic properties; second magnetization peak phenomenon; pinning force; magnetism and superconductivity

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MDPI and ACS Style

Galluzzi, A.; Buchkov, K.; Tomov, V.; Nazarova, E.; Leo, A.; Grimaldi, G.; Polichetti, M. High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon. Materials 2021, 14, 5214. https://doi.org/10.3390/ma14185214

AMA Style

Galluzzi A, Buchkov K, Tomov V, Nazarova E, Leo A, Grimaldi G, Polichetti M. High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon. Materials. 2021; 14(18):5214. https://doi.org/10.3390/ma14185214

Chicago/Turabian Style

Galluzzi, Armando, Krastyo Buchkov, Vihren Tomov, Elena Nazarova, Antonio Leo, Gaia Grimaldi, and Massimiliano Polichetti. 2021. "High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon" Materials 14, no. 18: 5214. https://doi.org/10.3390/ma14185214

APA Style

Galluzzi, A., Buchkov, K., Tomov, V., Nazarova, E., Leo, A., Grimaldi, G., & Polichetti, M. (2021). High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon. Materials, 14(18), 5214. https://doi.org/10.3390/ma14185214

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