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Pressure tuned ferromagnetism in CeRu(2)M(2)X (M = Al, Ga; X = B, C)
R E Baumbach1, X Lu, F Ronning
1MPA-CMMS Los Alamos National Laboratory, Los Alamos, NM 87545, USA. rbaumbach@lanl.gov
Abstract:
The temperature (T)-pressure (P) phase diagrams are reported for the tetragonal layered compounds CeRu(2)Al(2)B, CeRu(2)Ga(2)B, and CeRu(2)Ga(2)C, studied by magnetization, specific heat and electrical resistivity. These systems exhibit localized 4f magnetic ordering with ferromagnetic ground states at T(C) = 12.8 K, 16.3 K, and 17.2 K, respectively. Chemical and applied pressure both increase T(C) in a similar manner. The evolution of properties with chemical and applied pressure suggests that these phase diagrams may be connected in a Doniach-like picture where CeRu(2)Al(2)B is furthest from the possible quantum phase transition and CeRu(2)Ga(2)C is the nearest.
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