Anomalous effect of doping on the superconducting state of CeCoIn5 in high magnetic fields
Y. Tokiwa, R. Movshovich, F. Ronning, E. D. Bauer, A. D. Bianchi, Z. Fisk, J. D. Thompson
DOI 10.1103/PhysRevB.82.220502 · Physical Review B
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Abstract
We investigated the effect of electron and hole doping on the high-field low-temperature superconducting state in CeCoIn5 by measuring specific heat of CeCo(In1−xMx)5 with M=Sn, Cd, and Hg and x up to 0.33% at temperatures down to 0.1 K and fields up to 14 T. Although both Cd and Hg doping (hole doping) suppresses the zero-field Tc monotonically, Hc2 increases with small amounts of doping and has a maximum around x=0.2% (M=Cd). On the other hand, with Sn doping (electron doping) both zero-field Tc and Hc2 decrease monotonically. The critical temperature for the high-field low-temperature superconducting state correlates with Hc2 and Tc, which we interpret in support of the superconducting origin of this state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.25 | Pressure not reported | unknown |
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