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Magnetic excitations and anomalous spin-wave broadening in multiferroic FeV2O4
Physical Review B
  • Qiang Zhang, Iowa State University
  • Mehmet Ramazanoglu, Iowa State University
  • Songxue Chi, Oak Ridge National Laboratory
  • Yong Liu, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • David Vaknin, Iowa State University
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We report on the different roles of two orbital-active Fe2+ at the A site and V3+ at the B site in the magnetic excitations and on the anomalous spin-wave broadening in FeV2O4. FeV2O4 exhibits three structural transitions and successive paramagnetic (PM)–collinear ferrimagnetic (CFI)–noncollinear ferrimagnetic (NCFI)/ferroelectric transitions. The high-temperature tetragonal/PM–orthorhombic/CFI transition is accompanied by the appearance of a large energy gap in the magnetic excitations due to strong spin-orbit-coupling-induced anisotropy at the Fe2+ site. While there is no measurable increase in the energy gap from the orbital ordering of V3+ at the orthorhombic/CFI–tetragonal/NCFI transition, anomalous spin-wave broadening is observed in the orthorhombic/CFI state due to V3+ spin fluctuations at the B site. The spin-wave broadening is also observed at the zone boundary without softening in the NCFI/ferroelectric phase, which is discussed in terms of magnon-phonon coupling. Our study also indicates that the Fe2+ spins without the frustration at the A site may not play an important role in inducing ferroelectricity in the tetragonal/NCFI phase of FeV2O4.

This article is from Physical Review B 89 (2014): 224416, doi:10.1103/PhysRevB.89.224416. Posted with permission.

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American Physical Society
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Qiang Zhang, Mehmet Ramazanoglu, Songxue Chi, Yong Liu, et al.. "Magnetic excitations and anomalous spin-wave broadening in multiferroic FeV2O4" Physical Review B Vol. 89 Iss. 22 (2014) p. 224416
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