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Title: Magnetism in some UCo{sub 1/3}T{sub 2/3}Al solid solutions (T=transition metal)

Abstract

We report on the magnetic properties of UCo{sub 1/3}T{sub 2/3}Al (T=Ru, Rh, Pt) solid solutions which form in the hexagonal ZrNiAl structure. We performed neutron diffraction and bulk magnetization studies. All three solid solutions exhibit long-range magnetic order at low temperatures. Bulk magnetization studies indicate a ferromagnetic ground state for UCo{sub 1/3}Ru{sub 2/3}Al, UCo{sub 1/3}Rh{sub 2/3}Al, and UCo{sub 1/3}Pt{sub 2/3}Al below 42, 41, and 27 K, respectively. At 4.2 K, the spontaneous moment ranges from {approx}0.15 {mu}{sub B}/U-atom (UCo{sub 1/3}Ru{sub 2/3}Al) to {approx}0.49{mu}{sub B}/U-atom (UCo{sub 1/3}Pt{sub 2/3}Al). Below T{sub C}, we find additional weak magnetic contributions in the neutron diffraction data, and our refinement is consistent with magnetic moments along the c axis. The magnitudes of the moments are in good agreement with the spontaneous moments determined from bulk studies. The results are discussed in terms of f-d hybridization, which is modified by changes in the d band occupation and preferential occupation of the transition metals within the lattice. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [2];  [3];  [4];  [4];  [5]
  1. Department of Physics, New Mexico State University, MSC 3D, Las Cruces, New Mexico 88003 (United States)
  2. Institute of Physics, Academy of Sciences, 18040 Prague 8, The Czech Republic (Czech Republic)
  3. Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  4. Department of Electronic Structures, Charles University, 12116 Prague 2, The Czech Republic (Czech Republic)
  5. Department of Physics, San Diego State University, San Diego, California 92182 (United States)
Publication Date:
OSTI Identifier:
20216284
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; URANIUM ALLOYS; COBALT ALLOYS; ALUMINIUM ALLOYS; RUTHENIUM ALLOYS; RHODIUM ALLOYS; PLATINUM ALLOYS; SOLID SOLUTIONS; NEUTRON DIFFRACTION; MAGNETIZATION; MAGNETIC MOMENTS; HYBRIDIZATION; EXPERIMENTAL DATA

Citation Formats

Chang, S., Nakotte, H., Andreev, A. V., Bordallo, H. N., Havela, L., Sechovsky, V., and Torikachvili, M. S. Magnetism in some UCo{sub 1/3}T{sub 2/3}Al solid solutions (T=transition metal). United States: N. p., 2000. Web. doi:10.1063/1.372850.
Chang, S., Nakotte, H., Andreev, A. V., Bordallo, H. N., Havela, L., Sechovsky, V., & Torikachvili, M. S. Magnetism in some UCo{sub 1/3}T{sub 2/3}Al solid solutions (T=transition metal). United States. doi:10.1063/1.372850.
Chang, S., Nakotte, H., Andreev, A. V., Bordallo, H. N., Havela, L., Sechovsky, V., and Torikachvili, M. S. Mon . "Magnetism in some UCo{sub 1/3}T{sub 2/3}Al solid solutions (T=transition metal)". United States. doi:10.1063/1.372850.
@article{osti_20216284,
title = {Magnetism in some UCo{sub 1/3}T{sub 2/3}Al solid solutions (T=transition metal)},
author = {Chang, S. and Nakotte, H. and Andreev, A. V. and Bordallo, H. N. and Havela, L. and Sechovsky, V. and Torikachvili, M. S.},
abstractNote = {We report on the magnetic properties of UCo{sub 1/3}T{sub 2/3}Al (T=Ru, Rh, Pt) solid solutions which form in the hexagonal ZrNiAl structure. We performed neutron diffraction and bulk magnetization studies. All three solid solutions exhibit long-range magnetic order at low temperatures. Bulk magnetization studies indicate a ferromagnetic ground state for UCo{sub 1/3}Ru{sub 2/3}Al, UCo{sub 1/3}Rh{sub 2/3}Al, and UCo{sub 1/3}Pt{sub 2/3}Al below 42, 41, and 27 K, respectively. At 4.2 K, the spontaneous moment ranges from {approx}0.15 {mu}{sub B}/U-atom (UCo{sub 1/3}Ru{sub 2/3}Al) to {approx}0.49{mu}{sub B}/U-atom (UCo{sub 1/3}Pt{sub 2/3}Al). Below T{sub C}, we find additional weak magnetic contributions in the neutron diffraction data, and our refinement is consistent with magnetic moments along the c axis. The magnitudes of the moments are in good agreement with the spontaneous moments determined from bulk studies. The results are discussed in terms of f-d hybridization, which is modified by changes in the d band occupation and preferential occupation of the transition metals within the lattice. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372850},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}