Direct observation of the energy gap generating the 1 ∕ 3 magnetization plateau in the spin- 1 ∕ 2 trimer chain compound Cu 3 ( P 2 O 6 O D ) 2 by inelastic neutron scattering measurements
Direct observation of the energy gap generating the 1 ∕ 3 magnetization plateau in the spin- 1 ∕ 2 trimer chain compound Cu 3 ( P 2 O 6 O D ) 2 by inelastic neutron scattering measurements
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DOI：
10.1103/physrevb.76.064431
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
M. Hase;M. Matsuda;K. Kakurai;K. Ozawa;H. Kitazawa;N. Tsujii;A. Donni;M. Kohno;X. Hu
中科院分区：
文献类型：
--
作者：
M. Hase;M. Matsuda;K. Kakurai;K. Ozawa;H. Kitazawa;N. Tsujii;A. Donni;M. Kohno;X. Hu
我们用粉末样品的非弹性中子散射测量方法研究了${\mathrm{Cu}}_{3}{({\mathrm{P}}_{2}{\mathrm{O}}_{6}\mathrm{O}\mathrm{D})}_{2}$的磁性。该铜酸盐具有具有${J}_{1}\text{\ensuremath{-}}{J}_{2}\text{\ensuremath{-}}{J}_{2}$相互作用的自旋-$1/2$三聚物链，其中${J}_{1}$和${J}_{2}$表示两个反铁磁(AF)交换作用参数，表现出$1/3$磁化平台。我们观察到一个$9.8\phantom{{0.3em}{0ex}}\mathm{MEV}$$(114\phantom{\Rule{0.3em}{0ex}}\mathm{K})$的能隙，产生了磁化平台。该能隙对应于由主导的${J}_{1}$相互作用形成的AF二聚体的类单态-三态激发。我们确定了可以再现带隙大小和磁化强度的AF交换作用参数${J}_{1}=111\phantom{\rule{0.2em}{0ex}}\mathrm{K}$和${J}_{2}=30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$，。
We studied magnetism of ${\mathrm{Cu}}_{3}{({\mathrm{P}}_{2}{\mathrm{O}}_{6}\mathrm{O}\mathrm{D})}_{2}$ using inelastic neutron scattering measurements on a powder sample. This cuprate has spin-$1∕2$ trimer chains with ${J}_{1}\text{\ensuremath{-}}{J}_{2}\text{\ensuremath{-}}{J}_{2}$ interactions, where ${J}_{1}$ and ${J}_{2}$ denote two antiferromagnetic (AF) exchange interaction parameters, showing a $1∕3$ magnetization plateau. We observed an energy gap of $9.8\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ $(114\phantom{\rule{0.3em}{0ex}}\mathrm{K})$, which generated the magnetization plateau. The gap corresponds to singlet-triplet-like excitation of an AF dimer formed by the dominant ${J}_{1}$ interaction. We determined the AF exchange interaction parameters ${J}_{1}=111\phantom{\rule{0.2em}{0ex}}\mathrm{K}$ and ${J}_{2}=30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, which can reproduce the gap value as well as the magnetization.