Staggered-spin contribution to nuclear spin-lattice relaxation in two-leg antiferromagnetic spin- 1 2 ladders
Staggered-spin contribution to nuclear spin-lattice relaxation in two-leg antiferromagnetic spin- 1 2 ladders
复制标题
交错自旋对两腿反铁磁自旋中核自旋晶格弛豫的贡献 - 1 2 梯子
DOI：
10.1103/physrevb.59.4803
复制
发表时间：
1998
影响因子：
3.7
通讯作者：
P. Lee
中科院分区：
文献类型：
--
作者：
D. Ivanov;P. Lee
We study the nuclear spin-lattice relaxation rate ${1/T}_{1}$ in the two-leg antiferromagnetic spin-1/2 Heisenberg ladder. More specifically, we consider the contribution to ${1/T}_{1}$ from the processes with momentum transfer $(\ensuremath{\pi},\ensuremath{\pi}).$ In the limit of weak coupling between the two chains, this contribution is of activation type with gap $2\ensuremath{\Delta}$ at low temperatures $(\ensuremath{\Delta}$ is the spin gap), but crosses over to a slowly decaying temperature dependence at the crossover temperature $T\ensuremath{\approx}\ensuremath{\Delta}.$ This crossover possibly explains the recent high-temperature NMR results on ladder-containing cuprates by Imai et al.
