Magnetic and Superconducting Phase Diagramof Heavy Fermion Superconductors Ce1-x
ThxCu2.2Si2–Cu NMR and NQR Study

Kitaoka, Yoshio; Nakamura, Hiroyuki; Iwai, Taisuke; Asayama, Kunisuke; Ahlheim, Udo; Geibel, Christoph; Schank, Christina; Steglich, Frank

doi:10.1143/JPSJ.60.2122

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Magnetic and Superconducting Phase Diagramof Heavy Fermion Superconductors Ce_1-xTh_xCu_2.2Si₂–Cu NMR and NQR Study

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Citation

Kitaoka, Y., Nakamura, H., Iwai, T., Asayama, K., Ahlheim, U., Geibel, C., et al. (1991). Magnetic and Superconducting Phase Diagramof Heavy Fermion Superconductors Ce_1-xTh_xCu_2.2Si₂–Cu NMR and NQR Study. Journal of the Physical Society of Japan, 60(7), 2122-2126. doi:10.1143/JPSJ.60.2122.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-D53D-8

Abstract

The magnetic and superconducting phase diagram of Th-doped Ce1-xTh(x)Cu2.2Si2 has been established by Cu NMR and NQR technique and is compared with that of CeCu2.02Si2. Static magnetic ordering with T(N) = 2.4 K and 4.5 K for x = 0.08 and 0.12, respectively, is evidenced by a pronounced broadening of the Cu-63-NQR and -NMR spectra and a pronounced anomaly in the specific heat. In contrast, for the lightly Th-doped compounds with x less-than-or-equal-to 0.064, there has been observed neither a signature of a broadening of the NQR and NMR spectra nor an anomaly of the specific heat, but a dramatic reduction of the NMR and NQR intensities below a temperature ranging from 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 CeCu2.2Si2 should be distinguished from the static magnetic ordering in the heavily Th-doped systems.