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Title: Incommensurate crystal supercell and polarization flop observed in the magnetoelectric ilmenite MnTi O 3

Journal Article · · Physical Review B
 [1];  [2];  [3];  [2];  [4];  [5];  [2];  [6];  [7]
  1. Unv. of Manitoba, Winnipeg (Canada); Stanford Univ., CA (United States)
  2. Univ. of Manitoba, Winnipeg (Canada)
  3. Unv. of Manitoba, Winnipeg (Canada)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Florida State Univ., Tallahassee, FL (United States)
  6. Unv. of Manitoba, Winnipeg (Canada); McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  7. Florida State Univ., Tallahassee, FL (United States); Univ. of Tennessee, Knoxville, TN (United States)

In the last few years the magnetoelectric behavior of MnTiO3 has been observed even though its been studied for many decades. We use neutron scattering on two separately grown single crystals and two powder samples to show the presence of a supercell that breaks R (3) over bar symmetry. We also present the temperature and field dependence of the dielectric constant and pyroelectric current and show evidence of nonzero off-diagonal magnetoelectric tensor elements (forbidden by R (3) over bar symmetry) followed by a polarization flop accompanying the spin flop transition at mu H-0(SF) = 6.5T. Mossbauer spectroscopy on MnTiO3 gently doped with Fe-57 was used to help shed light on the impact of the supercell on the observed behavior. Moreover, the full supercell structure could not be solved at this time due to a lack of visible reflections, the full scope of the results presented here suggest that the role of local spin-lattice coupling in the magnetoelectric properties of MnTiO3 is likely more important than previously thought.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1261515
Alternate ID(s):
OSTI ID: 1238414
Journal Information:
Physical Review B, Vol. 93, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

References (38)

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  • Stękiel, Michał; Przeniosło, Radosław; Sosnowska, Izabela
  • Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, Vol. 71, Issue 2 https://doi.org/10.1107/S205252061500342X
journal March 2015
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