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Title: Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}

Abstract

The crystallographic and magnetic properties of the Mn[N(CN){sub 2}]{sub 2} compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antiferromagnetically coupled and spontaneously canted. The spin orientation is mainly along the a axis with a small uncompensated moment along the b axis. The ground state is a crystal-field sextet with large magnetic anisotropy. The crystal structure consists of discrete octahedra which are axially elongated and successively tilted in the ab plane. Comparisons of the magnetic structures for the isostructural M[N(CN){sub 2}]{sub 2} (M=Mn, Fe, Co, Ni) series suggest that the spin direction is stabilized by crystal fields and the spin canting is induced by the successive tilting of the octahedra. We propose that the superexchange interaction is the mechanism responsible for the magnetic ordering in these compounds and we find that a crossover from noncollinear antiferromagnetism to collinear ferromagnetism occurs for a superexchange angle of {alpha}{sub c}=142.0(5) degree sign . (c) 2000 The American Physical Society.

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [4];  [5];  [3];  [1]
  1. Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106 (United States)
  2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  3. Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850 (United States)
  4. National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310 (United States)
  5. Department of Chemistry, Indiana University Purdue University, Fort Wayne, Indiana 46805 (United States)
Publication Date:
OSTI Identifier:
20217476
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 62; Journal Issue: 9; Other Information: PBD: 1 Sep 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETIC MATERIALS; ANTIFERROMAGNETISM; CRYSTAL STRUCTURE; MAGNETIC PROPERTIES; MAGNETIZATION; MAGNETIC SUSCEPTIBILITY; SPECIFIC HEAT; NEUTRON DIFFRACTION; ANISOTROPY; CRYSTAL FIELD; EXCHANGE INTERACTIONS; NITROGEN COMPOUNDS; CYANOGEN; MANGANESE COMPOUNDS; IRON COMPOUNDS; COBALT COMPOUNDS; NICKEL COMPOUNDS; COPPER COMPOUNDS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Kmety, Carmen R, Huang, Qingzhen, Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742, Lynn, Jeffrey W, Erwin, Ross W, Manson, Jamie L, McCall, S, Crow, J E, Stevenson, Kenneth L, Miller, Joel S, Epstein, Arthur J, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185. Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.62.5576.
Kmety, Carmen R, Huang, Qingzhen, Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742, Lynn, Jeffrey W, Erwin, Ross W, Manson, Jamie L, McCall, S, Crow, J E, Stevenson, Kenneth L, Miller, Joel S, Epstein, Arthur J, & Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185. Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}. United States. https://doi.org/10.1103/PhysRevB.62.5576
Kmety, Carmen R, Huang, Qingzhen, Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742, Lynn, Jeffrey W, Erwin, Ross W, Manson, Jamie L, McCall, S, Crow, J E, Stevenson, Kenneth L, Miller, Joel S, Epstein, Arthur J, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185. Fri . "Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}". United States. https://doi.org/10.1103/PhysRevB.62.5576.
@article{osti_20217476,
title = {Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}},
author = {Kmety, Carmen R and Huang, Qingzhen and Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742 and Lynn, Jeffrey W and Erwin, Ross W and Manson, Jamie L and McCall, S and Crow, J E and Stevenson, Kenneth L and Miller, Joel S and Epstein, Arthur J and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185},
abstractNote = {The crystallographic and magnetic properties of the Mn[N(CN){sub 2}]{sub 2} compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antiferromagnetically coupled and spontaneously canted. The spin orientation is mainly along the a axis with a small uncompensated moment along the b axis. The ground state is a crystal-field sextet with large magnetic anisotropy. The crystal structure consists of discrete octahedra which are axially elongated and successively tilted in the ab plane. Comparisons of the magnetic structures for the isostructural M[N(CN){sub 2}]{sub 2} (M=Mn, Fe, Co, Ni) series suggest that the spin direction is stabilized by crystal fields and the spin canting is induced by the successive tilting of the octahedra. We propose that the superexchange interaction is the mechanism responsible for the magnetic ordering in these compounds and we find that a crossover from noncollinear antiferromagnetism to collinear ferromagnetism occurs for a superexchange angle of {alpha}{sub c}=142.0(5) degree sign . (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.62.5576},
url = {https://www.osti.gov/biblio/20217476}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 9,
volume = 62,
place = {United States},
year = {2000},
month = {9}
}