Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1–xPx)2 Ferromagnetic Superconductor
Abstract
Static (DC) and dynamic (AC, at 14 MHz and 8 GHz) magnetic susceptibilities of single crystals of a ferromagnetic superconductor, (x = 0.23), were measured in pristine state and after different doses of 2.5 MeV electron or 3.5 MeV proton irradiation. The superconducting transition temperature, , shows an extraordinarily large decrease. It starts at in the pristine sample for both AC and DC measurements, but moves to almost half of that value after moderate irradiation dose. Remarkably, after the irradiation not only moves significantly below the FM transition, its values differ drastically for measurements at different frequencies, ≈16 K in AC measurements and ≈12 K in a DC regime. We attribute such a large difference in to the appearance of the spontaneous internal magnetic field below the FM transition, so that the superconductivity develops directly into the mixed spontaneous vortex-antivortex state where the onset of diamagnetism is known to be frequency-dependent. We also examined the response to the applied DC magnetic fields and studied the annealing of irradiated samples, which almost completely restores the superconducting transition. Overall, our results suggest that in superconductivity is affected by local-moment ferromagnetism mostly via the spontaneous internal magnetic fields induced by the FM subsystem. Another mechanism is revealed upon irradiation where magnetic defects created in ordered lattice act as efficient pairbreakers leading to a significant reduction upon irradiation compared to other 122 compounds. On the other hand, the exchange interactions seem to be weakly screened by the superconducting phase leading to a modest increase of (less than 1 K) after the irradiation drives to below . Our results suggest that FM and SC phases coexist microscopically in the same volume.
- Authors:
-
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Ecole Polytechnique, Palaiseau (France)
- Ames Lab., Ames, IA (United States)
- Politecnico di Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
- Univ. of Tokyo (Japan)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Italian Ministry of Education, University and Research; Japan Society for the Promotion of Science (JSPS)
- OSTI Identifier:
- 1809236
- Report Number(s):
- IS-J-10,525
Journal ID: ISSN 1996-1944
- Grant/Contract Number:
- AC02-07CH11358; 201785KWLE; 17H01141
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 12; Journal ID: ISSN 1996-1944
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; tunnel diode resonator (TDR); coplanar waveguide resonator (CPWR); iron-based superconductors (IBS)
Citation Formats
Ghimire, Sunil, Kończykowski, Marcin, Cho, Kyuil, Tanatar, Makariy A., Torsello, Daniele, Veshchunov, Ivan S., Tamegai, Tsuyoshi, Ghigo, Gianluca, and Prozorov, Ruslan. Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1–xPx)2 Ferromagnetic Superconductor. United States: N. p., 2021.
Web. doi:10.3390/ma14123267.
Ghimire, Sunil, Kończykowski, Marcin, Cho, Kyuil, Tanatar, Makariy A., Torsello, Daniele, Veshchunov, Ivan S., Tamegai, Tsuyoshi, Ghigo, Gianluca, & Prozorov, Ruslan. Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1–xPx)2 Ferromagnetic Superconductor. United States. https://doi.org/10.3390/ma14123267
Ghimire, Sunil, Kończykowski, Marcin, Cho, Kyuil, Tanatar, Makariy A., Torsello, Daniele, Veshchunov, Ivan S., Tamegai, Tsuyoshi, Ghigo, Gianluca, and Prozorov, Ruslan. Sun .
"Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1–xPx)2 Ferromagnetic Superconductor". United States. https://doi.org/10.3390/ma14123267. https://www.osti.gov/servlets/purl/1809236.
@article{osti_1809236,
title = {Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1–xPx)2 Ferromagnetic Superconductor},
author = {Ghimire, Sunil and Kończykowski, Marcin and Cho, Kyuil and Tanatar, Makariy A. and Torsello, Daniele and Veshchunov, Ivan S. and Tamegai, Tsuyoshi and Ghigo, Gianluca and Prozorov, Ruslan},
abstractNote = {Static (DC) and dynamic (AC, at 14 MHz and 8 GHz) magnetic susceptibilities of single crystals of a ferromagnetic superconductor, EuFe2(As1–xPx)2 (x = 0.23), were measured in pristine state and after different doses of 2.5 MeV electron or 3.5 MeV proton irradiation. The superconducting transition temperature, Tc(H), shows an extraordinarily large decrease. It starts at Tc(H=0)≈24K in the pristine sample for both AC and DC measurements, but moves to almost half of that value after moderate irradiation dose. Remarkably, after the irradiation not only Tc moves significantly below the FM transition, its values differ drastically for measurements at different frequencies, ≈16 K in AC measurements and ≈12 K in a DC regime. We attribute such a large difference in Tc to the appearance of the spontaneous internal magnetic field below the FM transition, so that the superconductivity develops directly into the mixed spontaneous vortex-antivortex state where the onset of diamagnetism is known to be frequency-dependent. We also examined the response to the applied DC magnetic fields and studied the annealing of irradiated samples, which almost completely restores the superconducting transition. Overall, our results suggest that in EuFe2(As1–xPx)2 superconductivity is affected by local-moment ferromagnetism mostly via the spontaneous internal magnetic fields induced by the FM subsystem. Another mechanism is revealed upon irradiation where magnetic defects created in ordered Eu2+ lattice act as efficient pairbreakers leading to a significant Tc reduction upon irradiation compared to other 122 compounds. On the other hand, the exchange interactions seem to be weakly screened by the superconducting phase leading to a modest increase of Tm (less than 1 K) after the irradiation drives Tc to below Tm. Our results suggest that FM and SC phases coexist microscopically in the same volume.},
doi = {10.3390/ma14123267},
journal = {Materials},
number = 12,
volume = 14,
place = {United States},
year = {Sun Jun 13 00:00:00 EDT 2021},
month = {Sun Jun 13 00:00:00 EDT 2021}
}
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