Giant microwave absorption in fine powders of superconductors
Abstract
Enhanced microwave absorption, larger than that in the normal state, is observed in fine grains of type-II superconductors (MgB2 and K3C60) for magnetic fields as small as a few % of the upper critical field. The effect is predicted by the theory of vortex motion in type-II superconductors, however its direct observation has been elusive due to skin-depth limitations; conventional microwave absorption studies employ larger samples where the microwave magnetic field exclusion significantly lowers the absorption. We show that the enhancement is observable in grains smaller than the penetration depth. In conclusion, a quantitative analysis on K3C60 in the framework of the Coffey–Clem (CC) theory explains well the temperature dependence of the microwave absorption and also allows to determine the vortex pinning force constant.
- Authors:
-
[2];
[4];
- Budapest Univ. of Technology and Economics and MTA-BME Lendulet Spintronics Research Group (PROSPIN), Budapest (Hungary)
- Dept. de Fisica de Materiales Univ. Complutense de Madrid, Madrid (Spain)
- Mettler-Toledo GmbH, Nanikon (Switzerland)
- Hungarian Academy of Sciences, Budapest (Hungary)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1464489
- Report Number(s):
- IS-J-9647
Journal ID: ISSN 2045-2322; PII: 29750
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Csosz, G., Markus, B. G., Janossy, A., Nemes, N. M., Muranyi, F., Klupp, G., Kamaras, K., Kogan, V. G., Bud’ko, S. L., Canfield, P. C., and Simon, F. Giant microwave absorption in fine powders of superconductors. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-29750-7.
Csosz, G., Markus, B. G., Janossy, A., Nemes, N. M., Muranyi, F., Klupp, G., Kamaras, K., Kogan, V. G., Bud’ko, S. L., Canfield, P. C., & Simon, F. Giant microwave absorption in fine powders of superconductors. United States. https://doi.org/10.1038/s41598-018-29750-7
Csosz, G., Markus, B. G., Janossy, A., Nemes, N. M., Muranyi, F., Klupp, G., Kamaras, K., Kogan, V. G., Bud’ko, S. L., Canfield, P. C., and Simon, F. Tue .
"Giant microwave absorption in fine powders of superconductors". United States. https://doi.org/10.1038/s41598-018-29750-7. https://www.osti.gov/servlets/purl/1464489.
@article{osti_1464489,
title = {Giant microwave absorption in fine powders of superconductors},
author = {Csosz, G. and Markus, B. G. and Janossy, A. and Nemes, N. M. and Muranyi, F. and Klupp, G. and Kamaras, K. and Kogan, V. G. and Bud’ko, S. L. and Canfield, P. C. and Simon, F.},
abstractNote = {Enhanced microwave absorption, larger than that in the normal state, is observed in fine grains of type-II superconductors (MgB2 and K3C60) for magnetic fields as small as a few % of the upper critical field. The effect is predicted by the theory of vortex motion in type-II superconductors, however its direct observation has been elusive due to skin-depth limitations; conventional microwave absorption studies employ larger samples where the microwave magnetic field exclusion significantly lowers the absorption. We show that the enhancement is observable in grains smaller than the penetration depth. In conclusion, a quantitative analysis on K3C60 in the framework of the Coffey–Clem (CC) theory explains well the temperature dependence of the microwave absorption and also allows to determine the vortex pinning force constant.},
doi = {10.1038/s41598-018-29750-7},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {7}
}
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