Magnetic and Superconducting Phase Diagram of Heavy Fermion Superconductors Ce_<1-x>Th_xCu_<2.2>Si_2 : Cu NMR and NQR Study

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The magnetic and superconducting phase diagram of Th-doped Ce. .Th.Cu...Si.has been established by Cu NMR and NQR technique and is compared with that ofCeCu....Si.. Static magnetic ordering with T.=2.4 K and 4.5 K for,v=0.08 and 0.12,respectively, is evidenced by a pronounced broadening of the "Cu-NQR and -NMRspectra and a pronounced anomaly in the specific heat. In contrast, for the lightly Th-doped compounds with x@O.064, there has been observed neither a signature of abroadening of the NQR and NMR spectra nor an anomaly of the specific heat, but adramatic reduction of the NMR and NQR intensities below a temperature rangingfrom 0.9 K to 1.3 K upon increasing Th-content. It is emphasized that the unusual"magnetic transition" found in undoped and lightly Th-doped CeCu...Si. should bedistinguished from the static magnetic ordering in the heavily Th-doped systems.[heavy fermion, superconductivity, magnetic phase, NMR, NQR
社団法人日本物理学会の論文
1991-07-15