Min-Seok Park et al 2007 J. Phys.: Condens. Matter 19 242201 doi:10.1088/0953-8984/19/24/242201
Min-Seok Park1, Hyun-Sook Lee1, Jung-Dae Kim1, Heon-Jung Kim1, Myung-Hwa Jung2, Younghun Jo2 and Sung-Ik Lee1
Show affiliationsTo understand the effect of carbon doping on the superconductivity in MgB2, we obtained the angle- and temperature-dependent upper critical fields [Hc2(θ) and Hc2(T)] for Mg(B1−xCx)2 single crystals (x = 0.06 and 0.1) from resistivity measurements while varying the temperature, the field, and the direction of the field. The detailed values of the diffusivity for two different directions for each σ-band and π-band were obtained to explain both the temperature- and the angle-dependent Hc2 by using the dirty-limit two-gap model. The induced impurity scattering of the σ-band and the π-band for both the ab-plane and the c-direction is studied.
74.25.Op Mixed states, critical fields, and surface sheaths
74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.62.Dh Effects of crystal defects, doping and substitution
Issue 24 (20 June 2007)
Received 1 May 2007
Published 18 May 2007
Min-Seok Park et al 2007 J. Phys.: Condens. Matter 19 242201
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