EVIDENCE FOR A STRONG SPIN-PHONON INTERACTION IN CUPRIC OXIDE

被引:118
作者
CHEN, XK [1 ]
IRWIN, JC [1 ]
FRANCK, JP [1 ]
机构
[1] UNIV ALBERTA,DEPT PHYS,EDMONTON,AB T6G 2J1,CANADA
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 18期
关键词
D O I
10.1103/PhysRevB.52.R13130
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
When CuO is cooled below its Neel temperature (T-N2=213 K) the onset of long-range magnetic order effectively increases the unit-cell dimensions and additional peaks, corresponding to zone-folded phonons, appear in the Raman spectrum. The zone-folding mechanism in CuO is unusual in that one of the folded phonons hardens significantly in frequency as the sample is further cooled below T-N2. It is shown that this dependence on temperature is determined by the sublattice magnetization and that the unusually large shift in frequency is caused by a strong spin-phonon interaction in cupric oxide.
引用
收藏
页码:13130 / 13133
页数:4
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