Magnetic Properties of the Pseudo-Ternary System CeRh2Si2-xGex–A Kondo-Necklace
- 1 January 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (S3-1)
- https://doi.org/10.7567/jjaps.26s3.555
Abstract
CeRh2Si2 undergoes an antiferromagnetic phase transition at 37K which is unusually high for in Ce-based system. It is known that at moderate pressures, magnetic ordering in CeRh2Si2 is completely suppressed. Substituting Ge for Si, which is equivalent to applying a negative pressure to the system, gives rise to a very interesting effect: TN of the pseudo-ternary system CeRh2Si2-x Gex first increases (TN=38.5K for x = 0.125) and then decreases as x increases. The slope dTN(x)dx is largest at x = 1. X-ray measurements confirm that the system crystallizes in ThCr2Si2-structure for the entire range of x (0 x 2) and there is no anomaly in lattice constants. Magnetic susceptibility measurements carried out in the temperature interval 4.2K T 300K show that cerium atoms are in trivalent valence state. We argue that these observations can be understood on the basis of Doniach's Kondo-necklace model.Keywords
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