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Type: Artigo de periódico
Title: Magnetic Properties Of Nearly Stoichiometric Ceaubi2 Heavy Fermion Compound
Author: Adriano
C.; Rosa
P. F. S.; Jesus
C. B. R.; Grant
T.; Fisk
Z.; Garcia
D. J.; Pagliuso
P. G.
Abstract: Motivated by the interesting magnetic anisotropy found in the heavy fermion family CeTX2 (T = transition metal and X = pnictogen), here, we study the novel parent compound CeAu1-Bi-x(2)-(y) by combining magnetization, pressure dependent electrical resistivity, and heat-capacity measurements. The magnetic properties of our nearly stoichiometric single crystal sample of CeAu1-Bi-x(2)-(y) (x = 0.92 and y = 1.6) revealed an antiferromagnetic ordering at T-N = 12K with an easy axis along the c-direction. The field dependent magnetization data at low temperatures reveal the existence of a spin-flop transition when the field is applied along the c-axis (H-c similar to 7.5 T and T = 5 K). The heat capacity and pressure dependent resistivity data suggest that CeAu0.92Bi1.6 exhibits a weak heavy fermion behavior with strongly localized Ce3+ 4f electrons. Furthermore, the systematic analysis using a mean field model including anisotropic nearest-neighbors interactions and the tetragonal crystalline electric field (CEF) Hamiltonian allows us to extract a CEF scheme and two different values for the anisotropic J(RKKY) exchange parameters between the Ce3+ ions in this compound. Thus, we discuss a scenario, considering both the anisotropic magnetic interactions and the tetragonal CEF effects, in the CeAu1-Bi-x(2)-(y) compounds, and we compare our results with the isostructural compound CeCuBi2. (C) 2015 AIP Publishing LLC.
Subject: Superconductivity
Citation: Magnetic Properties Of Nearly Stoichiometric Ceaubi2 Heavy Fermion Compound. Amer Inst Physics, v. 117, p. MAY-2015.
Rights: embargo
Identifier DOI: 10.1063/1.4906279
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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