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Open Access Publications from the University of California

Anomalous effect of doping on the superconducting state of CeCoIn5in high magnetic fields

  • Author(s): Tokiwa, Y
  • Movshovich, R
  • Ronning, F
  • Bauer, ED
  • Bianchi, AD
  • Fisk, Z
  • Thompson, JD
  • et al.

We investigated the effect of electron and hole doping on the high-field low-temperature superconducting state in CeCoIn5by 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 Tcmonotonically, Hc2increases 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 Tcand Hc2decrease monotonically. The critical temperature for the high-field low-temperature superconducting state correlates with Hc2and Tc, which we interpret in support of the superconducting origin of this state. © 2010 The American Physical Society.

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