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Title: Nanosized helical magnetic domains in strongly frustrated Fe 3 PO 4 O 3

Abstract

Fe 3PO 4O 3 forms a noncentrosymmetric lattice structure (space group R3m) comprising triangular motifs of Fe 3+ coupled by strong antiferromagnetic interactions ( | Θ CW | > 900 K). Neutron diffraction from polycrystalline samples shows that strong frustration eventually gives way to an ordered helical incommensurate structure below T N =163 K, with the helical axis in the hexagonal ab plane and a modulation length to ~86 Å. The magnetic structure consists of an unusual needlelike correlation volume that extends past 900 Å along the hexagonal c axis but is limited to ~70 Å in the a b plane, despite the three-dimensional nature of the magnetic sublattice topology. The small in-plane correlation length, which persists to at least T = T N/40 , indicates a robust blocking of long-range order of the helical magnetic structure, and therefore stable domain walls, or other defect spin textures, must be abundant in Fe 3PO 4O 3. Temperature-dependent neutron powder diffraction reveals small negative thermal expansion below T N. No change in lattice symmetry is observed on cooling through T N, as revealed by high-resolution synchrotron x-ray diffraction. The previously reported reduced moment of the Fe 3+ ions (S = 5/2), μmore » ~ 4.2 μ B, is confirmed here through magnetization studies of a magnetically diluted solid solution series of compounds, Fe (3–x)Ga xPO 4O 3, and is consistent with the refined magnetic moment from neutron diffraction 4.14(2) μ B. Here, we attribute the reduced moment to a modified spin density distribution arising from ligand charge transfer in this insulating oxide.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Colorado State Univ., Fort Collins, CO (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1322370
Alternate Identifier(s):
OSTI ID: 1224362
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 13; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Ross, K. A., Bordelon, M. M., Terho, G., and Neilson, J. R. Nanosized helical magnetic domains in strongly frustrated Fe3PO4O3. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.134419.
Ross, K. A., Bordelon, M. M., Terho, G., & Neilson, J. R. Nanosized helical magnetic domains in strongly frustrated Fe3PO4O3. United States. doi:10.1103/PhysRevB.92.134419.
Ross, K. A., Bordelon, M. M., Terho, G., and Neilson, J. R. Mon . "Nanosized helical magnetic domains in strongly frustrated Fe3PO4O3". United States. doi:10.1103/PhysRevB.92.134419. https://www.osti.gov/servlets/purl/1322370.
@article{osti_1322370,
title = {Nanosized helical magnetic domains in strongly frustrated Fe3PO4O3},
author = {Ross, K. A. and Bordelon, M. M. and Terho, G. and Neilson, J. R.},
abstractNote = {Fe3PO4O3 forms a noncentrosymmetric lattice structure (space group R3m) comprising triangular motifs of Fe3+ coupled by strong antiferromagnetic interactions ( | ΘCW | > 900 K). Neutron diffraction from polycrystalline samples shows that strong frustration eventually gives way to an ordered helical incommensurate structure below TN =163 K, with the helical axis in the hexagonal ab plane and a modulation length to ~86 Å. The magnetic structure consists of an unusual needlelike correlation volume that extends past 900 Å along the hexagonal c axis but is limited to ~70 Å in the a b plane, despite the three-dimensional nature of the magnetic sublattice topology. The small in-plane correlation length, which persists to at least T = TN/40 , indicates a robust blocking of long-range order of the helical magnetic structure, and therefore stable domain walls, or other defect spin textures, must be abundant in Fe3PO4O3. Temperature-dependent neutron powder diffraction reveals small negative thermal expansion below TN. No change in lattice symmetry is observed on cooling through TN, as revealed by high-resolution synchrotron x-ray diffraction. The previously reported reduced moment of the Fe3+ ions (S = 5/2), μ ~ 4.2 μB, is confirmed here through magnetization studies of a magnetically diluted solid solution series of compounds, Fe(3–x)GaxPO4O3, and is consistent with the refined magnetic moment from neutron diffraction 4.14(2) μB. Here, we attribute the reduced moment to a modified spin density distribution arising from ligand charge transfer in this insulating oxide.},
doi = {10.1103/PhysRevB.92.134419},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 13,
volume = 92,
place = {United States},
year = {2015},
month = {10}
}

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