Effects of magnetic anisotropy on spin dynamics of ferromagnetic frustrated chain

International Conference on Strongly Correlated Electron Systems 2014

Onishi, Hiroaki^1

Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki-Tokai

319-1195, Japan^1

关键词: Antiferromagnetics;    Applied magnetic fields;    Density matrix renormalization group;    Easy-axis anisotropy;    Exchange anisotropy;    Longitudinal components;    Numerical results;    Transverse components;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012109/pdf
DOI  :  10.1088/1742-6596/592/1/012109

来源: IOP

【 摘 要 】

By exploiting density-matrix renormalization group techniques, we investigate the spin dynamics of a spin-1/2 one-dimensional J1-J2XXZ model with competing ferromagnetic J1and antiferromagnetic J2exchange couplings under applied magnetic fields. Numerical results of spin excitation spectra show that in the field-induced spin quadrupole regime, the longitudinal component has a gapless mode and the transverse component has a gapped mode irrespective of the exchange anisotropy. The excitation gap of the transverse spin excitation increases as the exchange anisotropy increases over the XY-like and Ising-like regions, demonstrating that two-magnon bound states are stabilized due to the easy-axis anisotropy.