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Title: Giant microwave absorption in fine powders of superconductors

Journal Article · · Scientific Reports
 [1];  [1];  [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [4];  [5];  [5];  [5];  [1]
  1. Budapest Univ. of Technology and Economics and MTA-BME Lendulet Spintronics Research Group (PROSPIN), Budapest (Hungary)
  2. Dept. de Fisica de Materiales Univ. Complutense de Madrid, Madrid (Spain)
  3. Mettler-Toledo GmbH, Nanikon (Switzerland)
  4. Hungarian Academy of Sciences, Budapest (Hungary)
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States)

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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1464489
Report Number(s):
IS-J-9647; PII: 29750
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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