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Low field magnetic relaxation of superconducting C60Rb3

✍ Scribed by L.M. Wang; H.C. Yang; J.H. Hwang; C.Y. Mou; H.E. Horng

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
145 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

The relaxation of magnetization M in superconducting C60Rb3 have been measured at different temperature ranges in low magnetic fields below T c to explore the flux pinning. The measurements were performed with a superconducting quantum interference magnetometer. The applied magnetic field was 300 G -600 G and the measured time at each temperature was 1 Γ— 104 sec. M versus lnt shows a linear behavior for t >_ 3600 sec. The data were analyzed in the framework of the flux pinning model of Anderson-Kim The analyses give the activation energy ofU(5K) ~ 20 mev ,and the critical current density based on Jc(T) oc [dM/dlnt] Γ— [U/kT] shows Jc oc (l-t) m, with the exponent m ~ 2.0. The results are discussed.

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