AC/DC Susceptibility of the Heavy-Fermion Superconductor CePt3Si under Pressure

Abstract

We have investigated the pressure dependence of ac and dc susceptibilities of the heavy-fermion superconductor CePt3Si (Tc= 0.75 K) that coexists with antiferromagnetism (TN = 2.2 K). As hydrostatic pressure is increased, Tc first decreases rapidly, then rather slowly near the critical pressure Pc = 0.6 GPa and shows a stronger decrease again at higher pressures, where Pc is the pressure at which TN becomes zero. A transition width and a difference in the two transition temperatures defined in the form of structures in the out-of-phase component of ac susceptibilities also become small near Pc, indicating that a double transition observed in CePt3Si is caused by some inhomogeneous property in the sample that leads to a spatial variation of local pressure. A sudden increase in the Meissner fraction above Pc suggests the influence of antiferromagnetism on superconductivity.

arXiv comment4 pages with 5 figures. This paper will be published in J. Phys. Soc. Jpn

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• Superconductivity and Magnetism in Non-centrosymmetric System: Application to CePt_3Si
• Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal
• Unusual behaviours and Impurity Effects in the Noncentrosymmetric Superconductor CePt3Si
• Specific Heat Study of Magnetic and Superconducting Transitions in CePt3Si
• Pair breaking by nonmagnetic impurities in the noncentrosymmetric superconductor CePt3Si
• Point-contact spectroscopy of the heavy-fermion superconductor CePt${}_3$Si
• Magnetic phase diagram of CePt3B1-xSix