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

Abstract

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
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
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

Citation Formats

Adriano, C., Jesus, C. B. R., Pagliuso, P. G., Rosa, P. F. S., University of California, Irvine, California 92697-4574, Grant, T., Fisk, Z., and Garcia, D. J. Magnetic properties of nearly stoichiometric CeAuBi{sub 2} heavy fermion compound. United States: N. p., 2015. Web. doi:10.1063/1.4906279.
Adriano, C., Jesus, C. B. R., Pagliuso, P. G., Rosa, P. F. S., University of California, Irvine, California 92697-4574, Grant, T., Fisk, Z., & Garcia, D. J. Magnetic properties of nearly stoichiometric CeAuBi{sub 2} heavy fermion compound. United States. doi:10.1063/1.4906279.
Adriano, C., Jesus, C. B. R., Pagliuso, P. G., Rosa, P. F. S., University of California, Irvine, California 92697-4574, Grant, T., Fisk, Z., and Garcia, D. J. Thu . "Magnetic properties of nearly stoichiometric CeAuBi{sub 2} heavy fermion compound". United States. doi:10.1063/1.4906279.
@article{osti_22409995,
title = {Magnetic properties of nearly stoichiometric CeAuBi{sub 2} heavy fermion compound},
author = {Adriano, C. and Jesus, C. B. R. and Pagliuso, P. G. and Rosa, P. F. S. and University of California, Irvine, California 92697-4574 and Grant, T. and Fisk, Z. and Garcia, D. J.},
abstractNote = {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}.},
doi = {10.1063/1.4906279},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}