Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, Zurich, Switzerland.
Phys Rev Lett. 2012 Apr 20;108(16):167201. doi: 10.1103/PhysRevLett.108.167201. Epub 2012 Apr 16.
The strong-leg S=1/2 Heisenberg spin ladder system (C(7)H(10)N)(2)CuBr(4) is investigated using density matrix renormalization group calculations, inelastic neutron scattering, and bulk magnetothermodynamic measurements. Measurements showed qualitative differences compared to the strong-rung case. A long-lived two-triplon bound state is confirmed to persist across most of the Brillouin zone in a zero field. In applied fields, in the Tomonaga-Luttinger spin-liquid phase, elementary excitations are attractive, rather than repulsive. In the presence of weak interladder interactions, the strong-leg system is considerably more prone to three-dimensional ordering.
强腿 S=1/2 海森堡自旋梯系统 (C(7)H(10)N)(2)CuBr(4) 利用密度矩阵重整化群计算、非弹性中子散射和整体磁热力学测量进行了研究。与强梯情况相比，测量结果显示出定性差异。在零场中，在整个布里渊区中证实了长寿命的两个三激子束缚态的存在。在施加磁场时，在 Tomonaga-Luttinger 自旋液体相中，元激发是吸引人的，而不是排斥的。在弱层间相互作用存在的情况下，强腿系统更容易发生三维有序化。
