Enhancement of the irreversibility field by carbon substitution in single crystal MgB${}_2$

Abstract

We report the detailed study of the irreversibility field {\hirr} of single crystals of Mg(B${}_{1-x}$C${}_x$)${}_2$ ($x$=0, 2, 3.5, 5 and 7%) in strong magnetic fields of up to 40 T. High sensitive torque measurements revealed that the {\hirr} is greatly enhanced by a factor of two (${\mu }_0${\hirr}(0)$\simeq$33 T in $x$=5%) by carbon substitution compared to the pristine {\mgb} owing to a reduction in the inplane coherence length. We also observed the temperature-dependent {\hirr} anisotropy in all the carbon contents. This fact strongly suggests that the two-gap superconductivity of {\mgb} is less influenced by a small amount of carbon substitution. We discuss these results focusing on the impact of carrier doping and impurity scattering on two-gap superconductor.

arXiv comment12 pages, 4 figures

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• Limits of the upper critical field in dirty two-gap superconductors
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• Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films
• Enhanced upper critical field in Co-doped Ba122 superconductors by lattice defect tuning
• First-principles prediction of phonon-mediated superconductivity in XBC (X= Mg, Ca, Sr, Ba)
• Infrared properties of Mg${}_{1-x}$Al${}_x($B${}_{1-y}$C${}_y$)${}_2$ single crystals in the normal and superconducting state
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors
• High-pressure high-temperature solution growth, structural, and superconducting properties of Fe-substituted MgB2 single crystals