We have performed multifrequency electron spin resonance (ESR) measurements of the triangular lattice antiferromagnet CuFeO2, which shows peculiar magnetic ordering and field-induced phase transitions, in high magnetic fields of up to 53 T. Our analysis of the ESR modes and energy dispersion explains the overall behaviors of magnetic excitations in the collinear 4-sublattice phase of this material. We show changes of the exchange interactions due to the lattice distortion of CuFeO2, suggesting strong spin-lattice coupling in this material. In addition, we evaluate the precise value of the magnetic anisotropy in CuFeO2 from the ESR and magnetization measurements. The presence of relatively large second- and third-nearest-neighbor intralayer exchange interactions is also indicated. We discuss that the strong spin-lattice coupling, the large farther neighbor exchange interactions, and the finite axial anisotropy are important to understand the magnetic phase transitions of CuFeO2.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Sep 30|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics