GRANULARITY AND UPPER CRITICAL FIELDS IN K3C60

Authors
HOU JG XIANG XD COHEN ML ZETTL A
Citation
Jg. Hou et al., GRANULARITY AND UPPER CRITICAL FIELDS IN K3C60, Physica. C, Superconductivity, 232(1-2), 1994, pp. 22-26
Citations number
19
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
232
Issue
1-2
Year of publication
1994
Pages
22 - 26
Database
ISI
SICI code
0921-4534(1994)232:1-2<22:GAUCFI>2.0.ZU;2-Y
Abstract
The magnetoresistance of superconducting K3C60 samples with different granularity has been measured in fields up to 7.5 T. The upper critica l field H(c2)(T) is dependent on the grain size of the K3C60 regions w ithin the sample: dH(c2)(T)/dT varies from -2.18 to -2.8 T/K near the superconducting transition temperature. At low temperatures, a small g rain size leads to an apparent enhancement in H(c2)(0).