Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K2V3O8 with magneto-dielectric couplings

Article

关键词: CRYSTAL-STRUCTURE;    POLARIZATION;    TEMPERATURE;    SPECTRA;   

DOI  :  10.1103/PhysRevB.85.144434

来源: SCIE

【 摘 要 】

Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S = 1/2 two-dimensional quantum spin compound K2V3O8. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm(-1) in A(1) symmetry. Two-magnon excitations in B-1 symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.

【 授权许可】

Free