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The upper critical field, $H_{c2}$, of Mg(B$_{1-x}$C$_x$)$_2$ has beenmeasured in order to probe the maximum magnetic field range forsuperconductivity that can be attained by C doping. Carbon doped boronfilaments are prepared by CVD techniques, and then these fibers are thenexposed to Mg vapor to form the superconducting compound. The transitiontemperatures are depressed about $1 K/%$ C and $H_{c2}(T=0)$ rises at about $5T/%$ C. This means that 3.5% C will depress $T_c$ from $39.2 K$ to $36.2 K$ andraise $H_{c2}(T=0)$ from $16.0 T$ to $32.5 T$. Higher fields are probablyattainable in the region of 5% C to 7% C. These rises in $H_{c2}$ areaccompanied by a rise in resistivity at $40 K$ from about $0.5 \mu \Omega cm$to about $10 \mu \Omega cm$. Given that the samples are polycrystalline wiresegments, the experimentally determined $H_{c2}(T)$ curves represent the upper$H_{c2}(T)$ manifold associated with $H\perp c$

physical review letters

Systematic Effects of Carbon Doping on the Superconducting Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Mg</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub></mml:math>

Systematic Effects of Carbon Doping on the Superconducting Properties ofMg(B1−xCx)2