Giant microwave absorption in fine powders of superconductors

G. Csősz, B. G. Márkus, A. Jánossy, N. M. Nemes, F. Murányi, G. Klupp, K. Kamarás, V. G. Kogan, S. L. Bud’ko, P. C. Canfield, F. Simon

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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. 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.

Original languageEnglish
Article number11480
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

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microwave absorption
vortices
exclusion
magnetic fields
quantitative analysis
penetration
microwaves
temperature dependence
augmentation

ASJC Scopus subject areas

  • General

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Giant microwave absorption in fine powders of superconductors. / Csősz, G.; Márkus, B. G.; Jánossy, A.; Nemes, N. M.; Murányi, F.; Klupp, G.; Kamarás, K.; Kogan, V. G.; Bud’ko, S. L.; Canfield, P. C.; Simon, F.

In: Scientific Reports, Vol. 8, No. 1, 11480, 01.12.2018.

Research output: Contribution to journalArticle

Csősz, G, Márkus, BG, Jánossy, A, Nemes, NM, Murányi, F, Klupp, G, Kamarás, K, Kogan, VG, Bud’ko, SL, Canfield, PC & Simon, F 2018, 'Giant microwave absorption in fine powders of superconductors', Scientific Reports, vol. 8, no. 1, 11480. https://doi.org/10.1038/s41598-018-29750-7
Csősz, G. ; Márkus, B. G. ; Jánossy, A. ; Nemes, N. M. ; Murányi, F. ; Klupp, G. ; Kamarás, K. ; Kogan, V. G. ; Bud’ko, S. L. ; Canfield, P. C. ; Simon, F. / Giant microwave absorption in fine powders of superconductors. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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