Direct evidence for the localized single-triplet excitations and the dispersive multitriplet excitations in SrCu2(BO3)2

被引:176
作者
Kageyama, H [1 ]
Nishi, M
Aso, N
Onizuka, K
Yosihama, T
Nukui, K
Kodama, K
Kakurai, K
Ueda, Y
机构
[1] Univ Tokyo, Inst Solid State Phys, Mat Design & Characterizat Lab, Chiba 2778581, Japan
[2] Univ Tokyo, Inst Solid State Phys, Neutron Scattering Lab, Tokai, Ibaraki 3191106, Japan
[3] Univ Tokyo, Inst Solid State Phys, Div New Mat Sci, Chiba 2778581, Japan
关键词
D O I
10.1103/PhysRevLett.84.5876
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We performed inelastic neutron scattering on the 2D Shastry-Sutherland system SrCu2((BO3)-B-10)(2) With an exact dimer ground state. Three energy levels at around 3, 5, and 9 meV were observed at 1.7 K. The lowest excitation at 3.0 meV is almost dispersionless with a bandwidth of 0.2 meV at most, showing a significant constraint on a single-triplet hopping owing to the orthogonality of the neighboring dimers. In contrast, the correlated two-tripler excitations at 5 meV exhibit a more dispersive behavior.
引用
收藏
页码:5876 / 5879
页数:4
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