MQR Study of Pressure induced Superconductivity in Antiferromagnetic Ce Compound.

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The main purpose of this subject is for the design of high pressure cell used for the NMR/NQR measurement at low temperatures and the NMR/NQR measurement of the constituted nuclei in the pressure-Induced superconductors. In the antiferromagnetic dense-Kondo compound CeInィイD23ィエD2 (TィイD2NィエD2=10 K), a small internal field (6 kOe at 1.6 K), which is parallel to the respective Ce-In planes, appears. The non-vanishing ィイD1115ィエD1In internal field means that Ce magnetic moments orient perpendicular to the (111) plans. With applied pressure, the internal field gradually decreases and disappears above 2.44 Gpa. The nuclear spin-lattice relaxation rate, 1/TィイD21ィエD2, is nearly temperature independent in the paramagnetic state and is strongly suppressed with increasing pressure. On further cooling through TィイD2NィエD2, 1/TィイD21ィエD2 decreases rapidly with no critical slowing down phenomena at TィイD2NィエD2 and varies in proportional to temperature at very low temperatures. Fermi liquid behavior was observed below 10 K at 2.74 Gpa. The NMR/NQR on other interesting pressure-induced superconductors such as CePdィイD22ィエD2SiィイD22ィエD2, CeNiィイD22ィエD2GeィイD22ィエD2 and CeRhInィイD25ィエD2 are also now in progress.