Carbon substitution in MgB2 single crystals: Structural and superconducting propertiesстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Carbon substitution in mgb2 single crystals: Structural and superconducting properties / S. M. Kazakov, R. Puzniak, K. Rogacki et al. // Physical Review B - Condensed Matter and Materials Physics. — 2005. — Vol. 71, no. 2. — P. 024533. The growth of carbon-substituted magnesium diboride Mg(B1-xCx)(2) single crystals with 0less than or equal toxless than or equal to0.15 is reported, and the structural, transport, and magnetization data are presented. The superconducting transition temperature decreases monotonically with increasing carbon content in the full investigated range of substitution. By adjusting the nominal composition, T-c of substituted crystals can be tuned in a wide temperature range between 10 and 39 K. Simultaneous introduction of disorder by carbon substitution and significant increase of the upper critical field H-c2 is observed. Comparing with the nonsubstituted compound, H-c2 at 15 K for x=0.05 is enhanced by more than a factor of 2 for H oriented both perpendicular and parallel to the ab plane. This enhancement is accompanied by a reduction of the H-c2-anisotropy coefficient gamma from 4.5 (for the nonsubstituted compound) to 3.4 and 2.8 for the crystals with x=0.05 and 0.095, respectively. At temperatures below 10 K, the single crystal with larger carbon content shows H-c2 (defined at zero resistance) higher than 7 and 24 T for H oriented perpendicular and parallel to the ab plane, respectively. Observed increase of H-c2 cannot be explained by the change in the coherence length due to the disorder-induced decrease of the mean free path only. [ DOI ]

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