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articleNo Access
TWO-GAP NATURE OF THE BULK SUPERCONDUCTOR (Mg_1-xAl_x)B₂ WITH LOW (x ≤ 0.07)Al DOPING
- MIN-SEOK PARK,
- JUNG-DAE KIM,
- HYE-GYONG LEE,
- HEON-JUNG KIM,
- SUNG-IK LEE,
- MYUNG-HWA JUNG, and
- YOUNGHUN JO
International Journal of Modern Physics B30 Jul 2007
Preview Abstract
We have investigated the two-gap nature of bulk (Mg_1-xAl_x)B₂ for 0 ≤ x ≤ 0.07 by studying the upper critical field H_c2(T). The H_c2(T) is analyzed based on the dirty-limit two-gap model. While the effective diffusivities of the π-band decreased gradually, those of the σ-band were relatively unchanged, which indicated that unlike the 2 dimensional σ-band, the isotropic π-band is seriously affected by the Al doping. The upward curvature of H_c2(T) near T_c is also explained by the dirty-limit two-gap model.

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