TITLE

Enhancement at low temperatures of the critical current density for Au-coated MgB[sub 2] thin films

AUTHOR(S)
Choi, Eun-Mi; Lee, Hyun-Sook; Kim, Heon-Jung; Lee, Sung-Ik; Kim, Hyeong-Jin; Kang, W. N.
PUB. DATE
January 2004
SOURCE
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p82
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We measured the superconducting critical current densities (J[sub c]) from the magnetization hysteresis (M–H) loop for Au-coated MgB[sub 2] thin films. The purpose of this experiment was to determine whether the vortex avalanche phenomenon which suppresses the J[sub c] for low temperature (T<15 K) and low field (H≤1000 Oe) could be cured by gold deposition. This avalanche, called flux noise, has been a headache in applications of MgB[sub 2] thin films. Fortunately, the flux noise in the M–H loop is suppressed with increasing Au-film thickness and finally disappears when the thickness of the gold becomes 2.55 μm. We found a way to remove one obstacle for applications of MgB[sub 2] thin films as an superconducting device. © 2004 American Institute of Physics.
ACCESSION #
11805672

 

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