Journal
PHYSICAL REVIEW LETTERS
Volume 92, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.92.217003
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The upper critical field, H-c2, 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 H-c2(T=0) rises by about 5 T/% C. This means that 3.8% C substitution will depress T-c from 39.2 to 36.2 K and raise H-c2(T=0) from 16.0 to 32.5 T. These rises in H-c2 are accompanied by a rise in resistivity at 40 K from about 0.5 to about 10 muOmega cm.
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