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Title: Neutron diffraction and μ SR studies of two polymorphs of nickel niobate NiNb 2 O 6

Abstract

Neutron diffraction and muon spin relaxation (μSR) studies are presented in this paper for the newly characterized polymorph of NiNb 2O 6 (β-NiNb 2O 6) with space group P4 2/n and μSR data only for the previously known columbite structure polymorph with space group Pbcn. The magnetic structure of the P4 2/n form was determined from neutron diffraction using both powder and single-crystal data. Powder neutron diffraction determined an ordering wave vector k=( 1/ 2, 1/ 2, 1/ 2). Single-crystal data confirmed the same k vector and showed that the correct magnetic structure consists of antiferromagnetically coupled chains running along the a or b axis in adjacent Ni 2+ layers perpendicular to the c axis, which is consistent with the expected exchange interaction hierarchy in this system. The refined magnetic structure is compared with the known magnetic structures of the closely related trirutile phases, NiSb 2O 6 and NiTa 2O 6. μSR data finds a transition temperature of T N~15K for this system, while the columbite polymorph exhibits a lower T N=5.7(3) K. Our μSR measurements also allowed us to estimate the critical exponent of the order parameter β for each polymorph. We found β =0.25(3) and 0.16(2) for themore » β and columbite polymorphs, respectively. The single-crystal neutron scattering data give a value for the critical exponent β =0.28(3) for β-NiNb 2O 6, in agreement with the μSR value. While both systems have β values less than 0.3, which is indicative of reduced dimensionality, this effect appears to be much stronger for the columbite system. Finally, in other words, although both systems appear to be well described by S=1 spin chains, the interchain interactions in the β polymorph are likely much larger.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [6];  [6];  [7];  [4];  [8];  [9]
  1. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Chemistry
  3. Canadian Neutron Beam Centre, Chalk River, ON (Canada)
  4. Zhejiang Univ., Hangzhou (China). Dept. of Physics
  5. Columbia Univ., New York, NY (United States). Dept. of Physics
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division. Neutron Sciences Directorate
  7. McMaster Univ., Hamilton, ON (Canada). Brockhouse Inst. for Materials Research
  8. McMaster Univ., Hamilton, ON (Canada). Brockhouse Inst. for Materials Research. Dept. of Chemistry
  9. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy. Brockhouse Inst. for Materials Research; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Publication Date:
Research Org.:
McMaster Univ., Hamilton, ON (Canada); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Ontario Graduate Scholarship (OGS) (Canada); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1423057
Alternate Identifier(s):
OSTI ID: 1399284
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 14; 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; 36 MATERIALS SCIENCE; antiferromagnetism; crystal growth; frustrated magnetism; magnetic interactions; magnetic order parameter; magnetic phase transitions; order parameters; antiferromagnets; magnetic systems; muon spin relaxation & rotation; neutron diffraction; condensed matter & materials physics

Citation Formats

Munsie, T. J. S., Wilson, M. N., Millington, A., Thompson, C. M., Flacau, R., Ding, C., Guo, S., Gong, Z., Aczel, A. A., Cao, H. B., Williams, T. J., Dabkowska, H. A., Ning, F., Greedan, J. E., and Luke, G. M. Neutron diffraction and μSR studies of two polymorphs of nickel niobate NiNb2O6. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.144417.
Munsie, T. J. S., Wilson, M. N., Millington, A., Thompson, C. M., Flacau, R., Ding, C., Guo, S., Gong, Z., Aczel, A. A., Cao, H. B., Williams, T. J., Dabkowska, H. A., Ning, F., Greedan, J. E., & Luke, G. M. Neutron diffraction and μSR studies of two polymorphs of nickel niobate NiNb2O6. United States. doi:10.1103/PhysRevB.96.144417.
Munsie, T. J. S., Wilson, M. N., Millington, A., Thompson, C. M., Flacau, R., Ding, C., Guo, S., Gong, Z., Aczel, A. A., Cao, H. B., Williams, T. J., Dabkowska, H. A., Ning, F., Greedan, J. E., and Luke, G. M. Fri . "Neutron diffraction and μSR studies of two polymorphs of nickel niobate NiNb2O6". United States. doi:10.1103/PhysRevB.96.144417. https://www.osti.gov/servlets/purl/1423057.
@article{osti_1423057,
title = {Neutron diffraction and μSR studies of two polymorphs of nickel niobate NiNb2O6},
author = {Munsie, T. J. S. and Wilson, M. N. and Millington, A. and Thompson, C. M. and Flacau, R. and Ding, C. and Guo, S. and Gong, Z. and Aczel, A. A. and Cao, H. B. and Williams, T. J. and Dabkowska, H. A. and Ning, F. and Greedan, J. E. and Luke, G. M.},
abstractNote = {Neutron diffraction and muon spin relaxation (μSR) studies are presented in this paper for the newly characterized polymorph of NiNb2O6 (β-NiNb2O6) with space group P42/n and μSR data only for the previously known columbite structure polymorph with space group Pbcn. The magnetic structure of the P42/n form was determined from neutron diffraction using both powder and single-crystal data. Powder neutron diffraction determined an ordering wave vector →k=(1/2,1/2,1/2). Single-crystal data confirmed the same →k vector and showed that the correct magnetic structure consists of antiferromagnetically coupled chains running along the a or b axis in adjacent Ni2+ layers perpendicular to the c axis, which is consistent with the expected exchange interaction hierarchy in this system. The refined magnetic structure is compared with the known magnetic structures of the closely related trirutile phases, NiSb2O6 and NiTa2O6. μSR data finds a transition temperature of TN~15K for this system, while the columbite polymorph exhibits a lower TN=5.7(3) K. Our μSR measurements also allowed us to estimate the critical exponent of the order parameter β for each polymorph. We found β =0.25(3) and 0.16(2) for the β and columbite polymorphs, respectively. The single-crystal neutron scattering data give a value for the critical exponent β =0.28(3) for β-NiNb2O6, in agreement with the μSR value. While both systems have β values less than 0.3, which is indicative of reduced dimensionality, this effect appears to be much stronger for the columbite system. Finally, in other words, although both systems appear to be well described by S=1 spin chains, the interchain interactions in the β polymorph are likely much larger.},
doi = {10.1103/PhysRevB.96.144417},
journal = {Physical Review B},
number = 14,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}

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