Pair breaking by nonmagnetic impurities in the noncentrosymmetric superconductor CePt3Si

Abstract

We have studied the effect of Ge substitution and pressure on the heavy-fermion superconductor CePt3Si. Ge substitution on the Si site acts as negative chemical pressure leading to an increase in the unit-cell volume but also introduces chemical disorder. We carried out electrical resistivity and ac heat-capacity experiments under hydrostatic pressure on CePt3Si1-xGex (x=0, 0.06). Our experiments show that the suppression of superconductivity in CePt3Si1-xGex is mainly caused by the scattering potential, rather than volume expansion, introduced by the Ge dopants. The antiferromagnetic order is essentially not affected by the chemical disorder.

arXiv comment4 pages, 4 figures

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• The Dominant Role of Critical Valence Fluctuations on High $T_{\mathrm{c}}$ Superconductivity in Heavy Fermions
• Effect of disorder on the pressure-induced superconducting state of CeAu2Si2
• Magnetic-field enhanced aniferromagnetism in non-centrosymmetric heavy-fermion superconductor CePt${}_3$Si
• Magnetic phase diagram of CePt3B1-xSix
• The magnetic ground state properties of non-centrosymmetric CePt${}_3$B${}_{1-x}$Si${}_x$