AC/DC Susceptibility of the Heavy-Fermion Superconductor CePt_3Si under Pressure(Condensed matter : electronic structure and electrical, magnetic, and optical properties)

概要

論文の詳細を見る
We have investigated the pressure dependence of ac and dc susceptibilities (χ_<ac> and χ_<dc>) of the heavy-fermion superconductor CePt_3Si (T_c=0.75K) that coexists with antiferromagnetism (T_N=2.2K). As hydrostatic pressure is increased, T_c first decreases rapidly, then rather slowly near the critical pressure P_c=0.6 GPa and shows a stronger decrease again at higher pressures, where P_c is the pressure at which T_N 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 χ_<ac> also become small near P_c, indicating that a double transition observed in CePt_3Si 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 P_c suggests the influence of antiferromagnetism on superconductivity.
社団法人日本物理学会の論文
2007-11-15