Competing exchange interactions in multiferroic and ferrimagnetic
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Budapest University of Technology and Economics and MTA-BME Lendulet Magneto-optical Spectroscopy Research Group (Hungary)
- National Institute of Chemical Physics and Biophysics (Estonia)
- Radboud University Nijmegen (The Netherlands). High Field Magnet Laboratory (HFML-EMFL)
- RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
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 .
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1341532
- Alternate ID(s):
- OSTI ID: 1341276
- Journal Information:
- Physical Review B, Vol. 95, Issue 2; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Swedenborgite CaBa(Mn 2 Fe 2 )O 7 with Spin Ordering on a Geometrically Frustrated, Polar, Non-centrosymmetric S = 5/2 Lattice
|
journal | October 2017 |
Similar Records
Nanosized helical magnetic domains in strongly frustrated
Pressure control of magnetic order and excitations in the pyrochlore antiferromagnet