Spin dynamics of the spin-ladder dimer-chain material Sr 14 Cu 24 O 41
Spin dynamics of the spin-ladder dimer-chain material Sr 14 Cu 24 O 41
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DOI：
10.1103/physrevlett.81.1702
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发表时间：
1997-11
影响因子：
8.6
通讯作者：
R. Eccleston;M. Uehara;J. Akimitsu;H. Eisaki;N. Motoyama;S. U. .. I. Facility;Clrc Rutherford Appleton Laboratory;D. Physics;A. University;Department of Superconductivity;T. U. O. Tokyo
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文献类型：
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作者：
R. Eccleston;M. Uehara;J. Akimitsu;H. Eisaki;N. Motoyama;S. U. .. I. Facility;Clrc Rutherford Appleton Laboratory;D. Physics;A. University;Department of Superconductivity;T. U. O. Tokyo
我们进行了非弹性中子散射的单晶样品的Sr 14 Cu 24 O 41研究的Cu 2 O3自旋梯层的自旋动力学，和CuO 2链。在入射能量为50 meV、200 meV、350 meV和500 meV时收集的数据与自旋能隙为32.5+/-0.1 meV且最大值为193.52.4 meV的色散最佳拟合，这与沿着阶梯的耦合一致，J|| = 130 meV和横档耦合J^=72 meV。我们发现，激发与能量转移约11.5毫电子伏可以单独描述的反铁磁内二聚体耦合，J1 = 11.2毫电子伏，次近邻铜离子和铁磁间二聚体耦合，J2 = -1.1毫电子伏之间的二聚体链。二聚体由两个Cu离子分开，为五个单元的二聚体链提供周期性。
We have performed inelastic neutron scattering on a single crystal sample of Sr14Cu24O41 to study the spin dynamics of the Cu2O3 spin ladder layers, and CuO2 chains. Data collected with incident energies of 50 meV, 200 meV, 350 meV and 500 meV are best fitted with a dispersion with a spin gap of 32.5+/-0.1 meV and a maximum of 193.52.4 meV, consistent with a coupling along the ladders, J|| = 130 meV and a rung coupling J^=72 meV. We find that excitations with an energy transfer of approximately 11.5 meV can be described solely in terms of a dimer chain with an antiferromagnetic intra-dimer coupling, J1 = 11.2 meV, between next-nearest-neighbour Cu ions and a ferromagnetic inter-dimer coupling, J2 = -1.1 meV. The dimers are separated by two Cu ions providing a periodicity for the dimer chain of five units.