Journal
PHYSICAL REVIEW B
Volume 107, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.107.195154
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Comparative study on single crystalline intermetallics CeInCu2 and NdInCu2 reveals similarities in their temperature-field phase diagrams, despite differences in thermal expansion and Gruneisen ratio that are more sensitive to Kondo hybridization. Both compounds exhibit ground-state magnetism derived from spin frustration and/or Kondo physics.
Single crystalline intermetallics CeInCu2 and NdInCu2, where the rare earth ions occupy geometrically frustrated fcc lattice of Heusler-type structure, have been studied comparatively to shed light on the ground-state magnetism derived from Kondo physics and/or spin frustration competing with the Ruderman-Kittel-Kasuya-Yosida interaction. CeInCu2 is distinct from NdInCu2 due to the significant Kondo effect that is absent in the latter. They order antiferromagnetically at TN approximate to 1.4 and 2.0 K with large paramagnetic Curie-Weiss temper-ature of -35.4 K and -41.1 K, respectively. The electronic specific-heat coefficient gamma = C/T (T -> 0) = 870 mJ mol-1 K-2 in CeInCu2 is significantly enhanced, much larger than 180 mJ mol-1 K-2 of the latter that is also enhanced albeit its non-Kondo nature. For both compounds, the Kadowaki-Woods ratio deviates greatly from the standard value expected from a Kramers doublet ground state, which, however, can be restored if one considers a smaller but still sizable gamma estimated from the paramagnetic state. Likewise, the Kondo temperature of CeInCu2 is revised to be TK approximate to 13 K that is double the literature values, manifesting a major effect of spin frustration to low-temperature thermodynamics beyond the Kondo physics. Similarities between the two compounds is also noticed in their temperature-field phase diagrams in spite of their thermodynamic distinctions in the thermal expansion and the Gruneisen ratio, which are much more sensitive to Kondo hybridization than to geometrical frustration.
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