Actions for Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide [electronic resource].

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Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 064,418 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper, we investigate the structure and magnetic properties of high-quality polycrystalline CeMnAsO, a parent compound of the “1111”-type oxypnictides using neutron powder diffraction and magnetization measurements. We find that CeMnAsO undergoes a C-type antiferromagnetic order with Mn2+(S=5/2) moments pointing along the c axis below a relatively high Néel temperature of TN=347(1) K. Below TSR=35 K, two simultaneous transitions occur where the Mn moments reorient from the c axis to the ab plane preserving the C-type magnetic order, and Ce moments undergo long-range AFM ordering with antiparallel moments pointing in the ab plane. Another transition to a noncollinear magnetic structure occurs below 7 K. The ordered moments of Mn and Ce at 2 K are 3.32(4) μB and 0.81(4)μB, respectively. We find that CeMnAsO primarily falls into the category of a local-moment antiferromagnetic insulator in which the nearest-neighbor interaction (J1) is dominant with J2<J1/2 in the context of J1-J2-Jc model. The spin reorientation transition driven by the coupling between Ce and the transition metal seems to be common to Mn, Fe, and Cr ions, but not to Co and Ni ions in the isostructural oxypnictides. Also, a schematic illustration of magnetic structures in Mn and Ce sublattices in CeMnAsO is presented.
Report Numbers
E 1.99:1265331
Subject(s)
Note
Published through SciTech Connect.
02/18/2015.
"KC0402010"
"ERKCSNX"
Physical Review B 91 6 ISSN 2469-9950 AM
Qiang Zhang; Wei Tian; Spencer G. Peterson; Kevin W. Dennis; David Vaknin.
Funding Information
AC05-00OR22725
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