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10.3390/ma17215340
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Article

Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal

by
Alina M. Badea (Ionescu)
1,
Ion Ivan
1,
Corneliu F. Miclea
1,
Daniel N. Crisan
1,
Armando Galluzzi
2,
Massimiliano Polichetti
2 and
Adrian Crisan
1,*
1
National Institute of Materials Physics, 405A Atomistilor Str., 077125 Magurele, Romania
2
Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy
*
Author to whom correspondence should be addressed.
Materials 2024, 17(21), 5340; https://doi.org/10.3390/ma17215340
Submission received: 5 October 2024 / Revised: 25 October 2024 / Accepted: 30 October 2024 / Published: 31 October 2024
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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Abstract

Among many iron-based superconductors, isovalently substituted BaFe2(As1−xPx)2 displays, for x ≈ 0.3, apart from the quite usual Second Magnetization Peak (SMP) in the field dependence of the critical current density, an unusual peak effect in the temperature dependence of the critical current density in the constant field, which is related to the rhombic-to-square (RST) structural transition of the Bragg vortex glass (BVG). By using multi-harmonic AC susceptibility investigations in three different cooling regimes—field cooling, zero-field cooling, and field cooling with measurements during warming up—we have discovered the existence of a temperature region in which there is a pronounced magnetic memory effect, which we attributed to the direction of the structural transition. The observed huge differences in the third harmonic susceptibility at low and high AC frequencies indicates the difference in the time-scale of the structural transition in comparison with the timescale of the vortex excitations. Our findings show that the RST influence on the vortex dynamics goes beyond the previously observed influence on the onset of the SMP.
Keywords: iron-based superconductors; anomalous peak effect; multi-harmonic susceptibility; magnetic memory effect; rhombic-to-square structural transition iron-based superconductors; anomalous peak effect; multi-harmonic susceptibility; magnetic memory effect; rhombic-to-square structural transition

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MDPI and ACS Style

Badea, A.M.; Ivan, I.; Miclea, C.F.; Crisan, D.N.; Galluzzi, A.; Polichetti, M.; Crisan, A. Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal. Materials 2024, 17, 5340. https://doi.org/10.3390/ma17215340

AMA Style

Badea AM, Ivan I, Miclea CF, Crisan DN, Galluzzi A, Polichetti M, Crisan A. Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal. Materials. 2024; 17(21):5340. https://doi.org/10.3390/ma17215340

Chicago/Turabian Style

Badea (Ionescu), Alina M., Ion Ivan, Corneliu F. Miclea, Daniel N. Crisan, Armando Galluzzi, Massimiliano Polichetti, and Adrian Crisan. 2024. "Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal" Materials 17, no. 21: 5340. https://doi.org/10.3390/ma17215340

APA Style

Badea, A. M., Ivan, I., Miclea, C. F., Crisan, D. N., Galluzzi, A., Polichetti, M., & Crisan, A. (2024). Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal. Materials, 17(21), 5340. https://doi.org/10.3390/ma17215340

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