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

R. H. T. Wilke; S. L. Bud’ko; P. C. Canfield; D. K. Finnemore; Raymond J. Suplinskas; S. T. Hannahs

doi:10.1103/PhysRevLett.92.217003

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

R. H. T. Wilke, S. L. Bud’ko, P. C. Canfield, D. K. Finnemore, Raymond J. Suplinskas, S. T. Hannahs

DOI 10.1103/PhysRevLett.92.217003 · Physical Review Letters

T1

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Abstract

The upper critical field, Hc2, of Mg(B1−xCx)2 has been measured in order to probe the maximum magnetic field range for superconductivity that can be attained by C doping. Carbon doped MgB2 filaments were prepared, and for carbon levels below 4% the transition temperatures are depressed by about 1 K/% C and Hc2(T=0) rises by about 5 T/% C. This means that 3.8% C substitution will depress Tc from 39.2 to 36.2 K and raise Hc2(T=0) from 16.0 to 32.5 T. These rises in Hc2 are accompanied by a rise in resistivity at 40 K from about 0.5 to about 10 μΩ cm.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mg(B1-xCx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.2	Pressure not reported	onset
Mg(B1-xCx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.2	Pressure not reported	onset
Mg(B1-xCx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37.9	Pressure not reported	onset
Mg(B1-xCx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.6	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39.2	Pressure not reported	onset
Mg(B1-xCx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	unknown