Garlea V O, Zheludev A, Masuda T, Manaka H, Regnault L-P, Ressouche E, Grenier B, Chung J-H, Qiu Y, Habicht K, Kiefer K, Boehm M
Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA.
Phys Rev Lett. 2007 Apr 20;98(16):167202. doi: 10.1103/PhysRevLett.98.167202. Epub 2007 Apr 19.
The weakly coupled quasi-one-dimensional spin ladder compound (CH3)2CHNH3CuCl3 is studied by neutron scattering in magnetic fields exceeding the critical field of Bose-Einstein condensation of magnons. Commensurate long-range order and the associated Goldstone mode are detected and found to be similar to those in reference to spin-dimer materials. However, for the upper two massive magnon branches, the observed behavior is totally different, culminating in a drastic collapse of excitation bandwidth beyond the transition point.
通过在超过磁振子玻色-爱因斯坦凝聚临界场的磁场中进行中子散射，对弱耦合准一维自旋梯子化合物(CH3)2CHNH3CuCl3进行了研究。检测到了相称的长程序和相关的戈德斯通模式，发现它们与自旋二聚体材料中的类似。然而，对于上两个有质量的磁振子分支，观察到的行为完全不同，在转变点之后激发带宽急剧崩溃。
