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Title: Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo 4 O 7

Competing exchange interactions can produce complex magnetic states together with spin-induced electric polarizations. With competing interactions on alternating triangular and kagome layers, the swedenborgite CaBaCo 4O 7 may have one of the largest measured spin-induced polarizations of ~1700 nC/cm 2 below its ferrimagnetic transition temperature at 70 K. Upon rotating our sample about c = [0,0,1] while the magnetic field is fixed along [1,0,0], the threefold splitting of the spin-wave frequencies indicates that our sample is hexagonally twinned. In addition, magnetization measurements then suggest that roughly 20% of the sample is in a domain with the a axis along [1,0,0] and that 80% of the sample is in one of two other domains with the a axis along either [-1/2,√3/2, 0] or [-1/2, -√3/2, 0] . Powder neutron-diffraction data, magnetization measurements, and terahertz (THz) absorption spectroscopy reveal that the complex spin order in each domain can be described as a triangular array of bitetrahedral c-axis chains ferrimagnetically coupled to each other in the ab plane. In conclusion, the electric-field dependence of bonds coupling those chains produces the large spin-induced polarization of CaBaCo 4O 7 .
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [5] ;  [5] ;  [7]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Budapest University of Technology and Economics and MTA-BME Lendulet Magneto-optical Spectroscopy Research Group (Hungary)
  3. National Institute of Chemical Physics and Biophysics (Estonia)
  4. Radboud University Nijmegen (The Netherlands). High Field Magnet Laboratory (HFML-EMFL)
  5. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  6. (Japan). Department of Advanced Materials Science
  7. (Japan). Department of Applied Physics
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1341532
Alternate Identifier(s):
OSTI ID: 1341276

Fishman, R. S., Bordács, S., Kocsis, V., Kézsmárki, I., Viirok, J., Nagel, U., Rõõm, T., Puri, A., Zeitler, U., Tokunaga, Y., University of Tokyo, Taguchi, Y., Tokura, Y., and University of Tokyo. Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo4O7. United States: N. p., Web. doi:10.1103/PhysRevB.95.024423.
Fishman, R. S., Bordács, S., Kocsis, V., Kézsmárki, I., Viirok, J., Nagel, U., Rõõm, T., Puri, A., Zeitler, U., Tokunaga, Y., University of Tokyo, Taguchi, Y., Tokura, Y., & University of Tokyo. Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo4O7. United States. doi:10.1103/PhysRevB.95.024423.
Fishman, R. S., Bordács, S., Kocsis, V., Kézsmárki, I., Viirok, J., Nagel, U., Rõõm, T., Puri, A., Zeitler, U., Tokunaga, Y., University of Tokyo, Taguchi, Y., Tokura, Y., and University of Tokyo. 2017. "Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo4O7". United States. doi:10.1103/PhysRevB.95.024423. https://www.osti.gov/servlets/purl/1341532.
@article{osti_1341532,
title = {Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo4O7},
author = {Fishman, R. S. and Bordács, S. and Kocsis, V. and Kézsmárki, I. and Viirok, J. and Nagel, U. and Rõõm, T. and Puri, A. and Zeitler, U. and Tokunaga, Y. and University of Tokyo and Taguchi, Y. and Tokura, Y. and University of Tokyo},
abstractNote = {Competing exchange interactions can produce complex magnetic states together with spin-induced electric polarizations. With competing interactions on alternating triangular and kagome layers, the swedenborgite CaBaCo4O7 may have one of the largest measured spin-induced polarizations of ~1700 nC/cm2 below its ferrimagnetic transition temperature at 70 K. Upon rotating our sample about c = [0,0,1] while the magnetic field is fixed along [1,0,0], the threefold splitting of the spin-wave frequencies indicates that our sample is hexagonally twinned. In addition, magnetization measurements then suggest that roughly 20% of the sample is in a domain with the a axis along [1,0,0] and that 80% of the sample is in one of two other domains with the a axis along either [-1/2,√3/2, 0] or [-1/2, -√3/2, 0] . Powder neutron-diffraction data, magnetization measurements, and terahertz (THz) absorption spectroscopy reveal that the complex spin order in each domain can be described as a triangular array of bitetrahedral c-axis chains ferrimagnetically coupled to each other in the ab plane. In conclusion, the electric-field dependence of bonds coupling those chains produces the large spin-induced polarization of CaBaCo4O7 .},
doi = {10.1103/PhysRevB.95.024423},
journal = {Physical Review B},
number = 2,
volume = 95,
place = {United States},
year = {2017},
month = {1}
}