NMR evidence for a "Generalized spin-peierls Transition" in the high-magnetic-field phase of the spin ladder Cu2(C5H12N2)2Cl4
NMR evidence for a "Generalized spin-peierls Transition" in the high-magnetic-field phase of the spin ladder Cu2(C5H12N2)2Cl4
复制标题
自旋梯 Cu2(C5H12N2)2Cl4 高磁场相中“广义自旋-皮尔斯跃迁”的 NMR 证据
DOI：
10.1103/physrevlett.85.4795
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发表时间：
2000
影响因子：
8.6
通讯作者：
Piovesana.
中科院分区：
文献类型：
--
作者：
Mayaffre;Horvatic;Berthier;Julien;Ségransan;Lévy;Piovesana.
通过在 70 mK-1.2 K 温度范围内测量 1H NMR 谱和 1/T1，探测了双腿自旋梯 Cu2(C5H12N2)2Cl4 的磁场感应 3D 有序相。二阶转变线 T(c)(H) 已在 H(c1) = 7.52 T 和 H(c2) = 13.5 T 之间确定，并变化为(H-H(c1))(2/3) 接近 H(c1)。从对 T(c) 上方 1/T1 的异常位移和交叉的观察来看，3D 转变的机制被认为是磁致弹性的，如自旋 Peierls 链中一样，这里涉及质子沿纵向交换 (J(平行)) 路径的位移。
The magnetic-field-induced 3D ordered phase of the two-leg spin ladder Cu2(C5H12N2)2Cl4 has been probed through measurements of 1H NMR spectra and 1/T1 in the temperature range 70 mK-1.2 K. The second order transition line T(c)(H) has been determined between H(c1) = 7.52 T and H(c2) = 13.5 T and varies as (H-H(c1))(2/3) close to H(c1). From the observation of anomalous shifts and a crossover in 1/T1 above T(c), the mechanism of the 3D transition is argued to be magnetoelastic as in spin-Peierls chains, here involving a displacement of the protons along the longitudinal exchange ( J( parallel)) path.