Spin dynamics of a canted antiferromagnet in a magnetic field

Article

关键词: METAL-INSULATOR-TRANSITION;    NEUTRON-DIFFRACTION;    PHASE;    SCATTERING;   

DOI  :  10.1103/PhysRevB.70.140402

来源: SCIE

【 摘 要 】

The spin dynamics of a canted antiferromagnet with a quadratic spin-wave dispersion near q=0 is shown to possess a unique signature. When the anisotropy gap is negligible, the spin-wave stiffness D-sw(q,B)=(omega(q)-B)/q(2) depends on whether the limit of zero field or zero wave vector is taken first. Consequently, D-sw is a strong funtion of the magnetic field at a fixed wave vector. Even in the presence of a sizable anisotropy gap, the field dependence of the extrapolated q=0 gap energy distinguishes a canted antiferromagnet from a phase-separated mixture containing both ferromagnetic and antiferromagnetic regions.

【 授权许可】

Free