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Title: Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe 3 PO 4 O 3 by magnetic dilution

Abstract

The insulating magnetic material Fe3PO4O3 features a noncentrosymmetric lattice composed of Fe3+ triangular units. Frustration, due to competing near-neighbor (J1) and next-nearest-neighbor (J2) antiferromagnetic interactions, was recently suggested to be the origin of an antiferromagnetic helical ground state with unusual needlelike nanoscale magnetic domains in Fe3PO4O3. Magnetic dilution is shown here to tune the ratio of these magnetic interactions, thus providing deeper insight into this unconventional antiferromagnet. Dilution of the Fe3+ lattice in Fe3PO4O3 was accomplished by substituting nonmagnetic Ga3+ to form the solid solution series Fe3-xGaxPO4O3 with x=0.012, 0.06, 0.25, 0.5, 1.0, 1.5. Magnetic susceptibility and neutron powder diffraction data from this series are presented. A continuous decrease of both the helical pitch length and the domain size is observed with increasing dilution up to at least x=0.25, while for x≥0.5, the compounds lack long-range magnetic order entirely. The decrease in the helical pitch length with increasing x can be qualitatively understood by reduction of the ratio of J2/J1 in the Heisenberg model, consistent with mean-field considerations. Intriguingly, the magnetic correlation length in the ab plane remains nearly equal to the pitch length for each value of x≤0.25, showing that the two quantities are intrinsically connected in this unusualmore » antiferromagnet.« less

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. Colorado State Univ., Fort Collins, CO (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1486922
Alternate Identifier(s):
OSTI ID: 1414866
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Tarne, M. J., Bordelon, M. M., Calder, S., Neilson, J. R., and Ross, K. A. Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe3PO4O3 by magnetic dilution. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.214431.
Tarne, M. J., Bordelon, M. M., Calder, S., Neilson, J. R., & Ross, K. A. Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe3PO4O3 by magnetic dilution. United States. https://doi.org/10.1103/PhysRevB.96.214431
Tarne, M. J., Bordelon, M. M., Calder, S., Neilson, J. R., and Ross, K. A. Tue . "Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe3PO4O3 by magnetic dilution". United States. https://doi.org/10.1103/PhysRevB.96.214431. https://www.osti.gov/servlets/purl/1486922.
@article{osti_1486922,
title = {Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe3PO4O3 by magnetic dilution},
author = {Tarne, M. J. and Bordelon, M. M. and Calder, S. and Neilson, J. R. and Ross, K. A.},
abstractNote = {The insulating magnetic material Fe3PO4O3 features a noncentrosymmetric lattice composed of Fe3+ triangular units. Frustration, due to competing near-neighbor (J1) and next-nearest-neighbor (J2) antiferromagnetic interactions, was recently suggested to be the origin of an antiferromagnetic helical ground state with unusual needlelike nanoscale magnetic domains in Fe3PO4O3. Magnetic dilution is shown here to tune the ratio of these magnetic interactions, thus providing deeper insight into this unconventional antiferromagnet. Dilution of the Fe3+ lattice in Fe3PO4O3 was accomplished by substituting nonmagnetic Ga3+ to form the solid solution series Fe3-xGaxPO4O3 with x=0.012, 0.06, 0.25, 0.5, 1.0, 1.5. Magnetic susceptibility and neutron powder diffraction data from this series are presented. A continuous decrease of both the helical pitch length and the domain size is observed with increasing dilution up to at least x=0.25, while for x≥0.5, the compounds lack long-range magnetic order entirely. The decrease in the helical pitch length with increasing x can be qualitatively understood by reduction of the ratio of J2/J1 in the Heisenberg model, consistent with mean-field considerations. Intriguingly, the magnetic correlation length in the ab plane remains nearly equal to the pitch length for each value of x≤0.25, showing that the two quantities are intrinsically connected in this unusual antiferromagnet.},
doi = {10.1103/PhysRevB.96.214431},
journal = {Physical Review B},
number = 21,
volume = 96,
place = {United States},
year = {Tue Dec 26 00:00:00 EST 2017},
month = {Tue Dec 26 00:00:00 EST 2017}
}

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