Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb)

Tan, Xiaoyan; Ovidiu Garlea, V.; Chai, Ping; Geondzhian, Andrey Y.; Yaroslavtsev, Alexander A.; Xin, Yan; Menushenkov, Alexey P.; Chernikov, Roman V.; Shatruk, Michael

doi:10.1016/j.jssc.2015.08.038

Title: Synthesis, crystal structure, and magnetism of A₂Co₁₂As₇ (A=Ca, Y, Ce–Yb)

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2015.08.038· OSTI ID:1261277

Tan, Xiaoyan ^[1]; Ovidiu Garlea, V. ^[2]; Chai, Ping ^[1]; Geondzhian, Andrey Y. ^[3]; Yaroslavtsev, Alexander A. ^[4]; Xin, Yan ^[5]; Menushenkov, Alexey P. ^[3]; Chernikov, Roman V. ^[6]; Shatruk, Michael ^[1]

Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst.
National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst.; European XFEL GmbH, Hamburg (Germany)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Photon Science

In this study, ternary intermetallics, A₂Co₁₂As₇ (A=Ca, Y, Ce–Yb), have been synthesized by annealing mixtures of elements in molten Bi at 1223 K. The materials obtained crystallize in the P6₃/m variant of the Zr₂Fe₁₂P₇ structure type. The unit cell volume shows a monotonic decrease with the increasing atomic number of the rare-earth metal, with the exception of Ce-, Eu-, and Yb-containing compounds. An examination of these outliers with X-ray absorption near edge structures (XANES) spectroscopy revealed mixed valence of Ce, Eu, and Yb, with the average oxidation states of +3.20(1), +2.47(5), and +2.91(1), respectively, at room temperature. Magnetic behavior of A₂Co₁₂As₇ is generally characterized by ferromagnetic ordering of Co 3d moments at 100–140 K, followed by low-temperature ordering of rare-earth 4f moments. The 3d-4f magnetic coupling changes from antiferromagnetic for A=Pr–Sm to ferromagnetic for A=Ce and Eu–Yb. Finally, polarized neutron scattering experiments were performed to support the postulated ferro- and ferrimagnetic ground states for Ce₂Co₁₂As₇ and Nd₂Co₁₂As₇, respectively.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Russian Science Foundation

Grant/Contract Number:: AC05-00OR22725; DMR-1507233; 14-22-00098

OSTI ID:: 1261277

Alternate ID(s):: OSTI ID: 1279011

Journal Information:: Journal of Solid State Chemistry, Vol. 236; ISSN 0022-4596

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Driving the europium valence state in EuCo$_{2}$As$_{2}$ by external and internal impact Menushenkov, Alexey; Yaroslavtsev, A.; Geondzhian, A. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2016-05357	text	January 2017

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Title: Synthesis, crystal structure, and magnetism of A₂Co₁₂As₇ (A=Ca, Y, Ce–Yb)