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Title: Magnetic properties of nearly stoichiometric CeAuBi{sub 2} heavy fermion compound

Motivated by the interesting magnetic anisotropy found in the heavy fermion family CeTX{sub 2} (T = transition metal and X = pnictogen), here, we study the novel parent compound CeAu{sub 1−x}Bi{sub 2−y} by combining magnetization, pressure dependent electrical resistivity, and heat-capacity measurements. The magnetic properties of our nearly stoichiometric single crystal sample of CeAu{sub 1−x}Bi{sub 2−y} (x = 0.92 and y = 1.6) revealed an antiferromagnetic ordering at T{sub N} = 12 K 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{sub c} ∼ 7.5 T and T = 5 K). The heat capacity and pressure dependent resistivity data suggest that CeAu{sub 0.92}Bi{sub 1.6} exhibits a weak heavy fermion behavior with strongly localized Ce{sup 3+} 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{sub RKKY} exchange parameters between the Ce{sup 3+} ions in this compound. Thus, we discuss a scenario, considering both the anisotropic magnetic interactions and the tetragonal CEF effects, in the CeAu{sub 1−x}Bi{sub 2−y} compounds, and we compare our results with the isostructural compoundmore » CeCuBi{sub 2}.« less
Authors:
; ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Instituto de Física “Gleb Wataghin,” UNICAMP, Campinas-SP, 13083-859 (Brazil)
  2. (United States)
  3. University of California, Irvine, California 92697-4574 (United States)
  4. Instituto Balseiro, Centro Atomico Bariloche, CNEA and CONICET, 8400 Bariloche (Argentina)
Publication Date:
OSTI Identifier:
22409995
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ANTIFERROMAGNETISM; BISMUTH COMPOUNDS; CERIUM COMPOUNDS; CERIUM IONS; COMPARATIVE EVALUATIONS; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRIC FIELDS; ELECTRONS; GOLD COMPOUNDS; HAMILTONIANS; MAGNETIC PROPERTIES; MAGNETIZATION; MEAN-FIELD THEORY; MONOCRYSTALS; PRESSURE DEPENDENCE; SPECIFIC HEAT; YTTRIUM COMPOUNDS