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By means of neutron scattering measurements, we have investigated spin-waveexcitation in a collinear four-sublattice (4SL) magnetic ground state of atriangular lattice antiferromagnet CuFeO2, which has been of recent interest asa strongly frustrated magnet, a spin-lattice coupled system and a multiferroic.To avoid mixing of spin-wave spectrum from magnetic domains having threedifferent orientations reflecting trigonal symmetry of the crystal structure,we have applied uniaxial pressure on [1-10] direction of a single crystalCuFeO2. By elastic neutron scattering measurements, we have found that only 10MPa of the uniaxial pressure results in almost 'single domain' state in the 4SLphase. We have thus performed inelastic neutron scattering measurements usingthe single domain sample, and have identified two distinct spin- wave branches.The dispersion relation of the upper spin-wave branch cannot be explained bythe previous theoretical model [R. S. Fishman: J. Appl. Phys. 103 (2008)07B109]. This implies the importance of the lattice degree of freedom in thespin-wave excitation in this system, because the previous calculation neglectedthe effect of the spin-driven lattice distortion in the 4SL phase. We have alsodiscussed relationship between the present results and the recently discovered"electromagnon" excitation.

Spin-Wave Spectrum in `Single-Domain' Magnetic Ground State of Triangular Lattice Antiferromagnet CuFeO2