Influence of disorder strength on the superconducting mechanism of MgB 2
Abstract
We investigate the effect of disorder on the superconducting mechanism of MgB 2 thin films using low-energy ion irradiation. The c -axis lattice constant and T c of MgB 2 thin films change systematically as the magnitude of disorder, which corresponds to the value of average displacements per atom ( dpa avg ), increases. Here, dpa avg is controlled by the amount of irradiated ions. The dpa avg dependence of the electron–phonon coupling constants ( λ ) is estimated using the McMillan equation. For dpa avg ⩽ 0.049, λ is linearly proportional to dpa avg . On the other hand, for dpa avg > 0.049, the T c of the disordered MgB 2 deviates from the linear fitting curve, and insulating behavior is observed in the normal state resistivity. These results indicate that the superconducting mechanism of MgB 2 can be changed by the electronic system caused by disorder strength affecting the electron–phonon coupling constant λ .
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These HEA films exhibit resistance to displacement damage more than 1000 times greater than that of other promising superconductors such as Nb3Sn, MgB2, iron-based superconductors, and high-Tc cuprate superconductors.
“Notably, these HEA fi lms exhibit resistance to displacement damage that is more than 1000 times greater than that of other promising superconductors with technological applications, such as Nb3Sn, MgB2, iron-based superconductors, and highT c cuprate superconductors 99 -102 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [100]
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References 48 · Cited by 7
- Authors
- Lee, J. M., Jung, S.-G., Han, Y., Park, T.-H., Jang, J., Jeon, H.-R., Yeo, S., Choi, H.-Y., Park, T., & Kang, W. N.
- Affiliations
- Sungkyunkwan University (KR)
- Korea Atomic Energy Research Institute (KR)
- ORCID
- Venue
- Superconductor Science and Technology
- Publisher
- IOP Publishing
- Published
- 2021-11-25
- Volume
- 35
- Issue
- 1
- Pages
- 015001
- ISSN
- 0953-2048 (ISSN-L)
- 1361-6668
- OpenAlex
- W3211894748
- Cited by
- 7
- References
- 48
- Citations by year
- 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2
- FWCI
- 0.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Superconductor Science and Technology (publishedVersion)
- Funders
- National Research Foundation of Korea (2019R1F1A1055284)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Superconductivity in MgB2 and Alloys
- Physical Sciences › Materials Science › Materials Chemistry › Boron and Carbon Nanomaterials Research
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- MgB2, superconducting mechanism, disorder strength, electron-phonon coupling, low-energy ion irradiation, thin films, c-axis lattice constant, critical temperature, normal state resistivity, insulating behavior, McMillan equation
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