Structural and Magnetic Properties of RAg (R=La,Ce,Pr and Nd) at Hydrostatic Pressures up to 37 kbar

概要

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Pressure-induced structural transitions and associated changes in magnetism of thelight RAg have been thoroughly investigated from measurements of electrical resistivity p, ac magnetic susceptibility up to 37 kbar, magnetization o up to 15 kbar and corn-pressibility up to 3 kbar in temperatures from 1.5 K to 300 K. A cubic to tetragonalstructural transition 7'.is found to be induced at pressure p.=6, 2, 10 and 30 kbarfor R=La, Ce, Pr and Nd, respectively, and to increase with further increasing p atabout the same rate of 113 - -l- 16 K/ kbar. The appearance of T. and the differentp. values for the RAg are discussed on the basis of the band Jahn-Teller model. 7'. isaccompanied by a shift of the magnetic ordering temperature T.... For CeAg,another structural transition T.. is also found at p=20 kbar. The remarkably largerpressure effects of T...., p and o are briefly discussed with recent theories of the Kondo lattice.
社団法人日本物理学会の論文
1987-11-15