Unifying magnons and triplons in stripe-ordered cuprate superconductors.
Unifying magnons and triplons in stripe-ordered cuprate superconductors.
复制标题
将磁振子和三振子统一在条状铜酸盐超导体中。
DOI：
10.1103/physrevlett.93.267003
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发表时间：
2004
影响因子：
8.6
通讯作者：
Markus Grüninger
中科院分区：
文献类型：
--
作者：
G. Uhrig;K. P. Schmidt;Markus Grüninger
基于耦合两腿自旋梯的二维模型，我们得出了条状La15/8Ba1/8CuO4近期中子散射数据的统一图像，即上部结构卫星周围的低能磁振子和较高能量的三子激发。条状相中反铁磁波矢量 Q(AF) 处的共振峰对应于磁激励色散中的鞍点。对于 J=130-160 meV 和 Jcyc/J=0.2-0.25，获得了与中子数据的定量一致性。
Based on a two-dimensional model of coupled two-leg spin ladders, we derive a unified picture of recent neutron scattering data of stripe-ordered La15/8Ba1/8CuO4, namely, of the low-energy magnons around the superstructure satellites and of the triplon excitations at higher energies. The resonance peak at the antiferromagnetic wave vector Q(AF) in the stripe-ordered phase corresponds to a saddle point in the dispersion of the magnetic excitations. Quantitative agreement with the neutron data is obtained for J=130-160 meV and Jcyc/J=0.2-0.25.