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

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4906279· OSTI ID:22409995

Adriano, C.; Jesus, C. B. R.; Pagliuso, P. G. ^[1]; Rosa, P. F. S. ^[1]; Grant, T.; Fisk, Z. ^[2]; Garcia, D. J. ^[3]

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1. Instituto de Física “Gleb Wataghin,” UNICAMP, Campinas-SP, 13083-859 (Brazil)
2. University of California, Irvine, California 92697-4574 (United States)
3. Instituto Balseiro, Centro Atomico Bariloche, CNEA and CONICET, 8400 Bariloche (Argentina)

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 compound CeCuBi{sub 2}.

• OSTI ID: 22409995
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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