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Acta Physica Sinica (Overseas Edition), 1999, Vol. 8(11): 860-868    DOI: 10.1088/1004-423X/8/11/010
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev  

NON-EQUILIBRIUM MICROWAVE RESPONSE OF Yba2Cu3O7-$\delta$ GRANULAR THIN FILMS UNDER MAGNETIC FIELDS

ABBAS A.ESSA, XU KE-XI (徐克西), ZHOU SHI-PING (周世平), BAO JIA-SHAN (鲍家善)
Physics Department, Shanghai University, Shanghai 201800, China
Abstract  Microwave responses of YBa2Cu3O7-$\delta$(YBCO) granular film have been studied at the microwave frequency of 30.5 GHz. In the absence of a magnetic field the dependence of a normal microwave response on the bias current is observed at a temperature close to Tc. When a magnetic field ranged from 5.0 mT to 33.0 mT is applied, the responses broaden and shift toward a lower temperature. In the superconducting state, the responses were found to be highly dependent on the magnetic field. For the current equal to 5.0mA and a magnetic field above 17.0mT the response increases and did not vanish even at a very low temperature, the fact is believed to be correlated to the anisotropic character of the structure.
Received:  22 March 1999      Revised:  15 June 1999      Accepted manuscript online: 
PACS:  74.78.Bz  
  74.72.Bk  
  74.25.Nf  
  74.81.Bd (Granular, melt-textured, amorphous, and composite superconductors)  
Fund: Project supported by the Nature Science Foundation of Shanghai Education Committee, China (Grant No. 97AJ08).

Cite this article: 

ABBAS A.ESSA, XU KE-XI (徐克西), ZHOU SHI-PING (周世平), BAO JIA-SHAN (鲍家善) NON-EQUILIBRIUM MICROWAVE RESPONSE OF Yba2Cu3O7-$\delta$ GRANULAR THIN FILMS UNDER MAGNETIC FIELDS 1999 Acta Physica Sinica (Overseas Edition) 8 860

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