Magnetic-Order Crossover in Coupled Spin Ladders
Magnetic-Order Crossover in Coupled Spin Ladders
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DOI：
10.1103/physrevlett.118.167206
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发表时间：
2017-04-20
影响因子：
8.6
通讯作者：
Horvatic, M.
中科院分区：
文献类型：
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作者：
Jeong, M.;Mayaffre, H.;Horvatic, M.
我们报道了典型的自旋1/2海森堡反铁磁梯状化合物(C7H10N)(2)CuBr4在长程有序相中的一种新的交叉行为。以前从(N核磁共振)-N-14谱线的连续对称分裂中证明了这种交错顺序，将温度降低到接近或等于330mK时，饱和接近。150千米。出乎意料的是，分裂的线条在T*以下开始进一步分离，类似于100mk，而线宽和线形保持完全不变。核磁共振弛豫速率T-1(-1)的测量进一步证实了这种交叉行为。在T*以上观察到的反映有序性的非常强的抑制T-1(-1)类似于T-5.5，被类似于T*以下的T-1(-1)取代。这些原始的核磁共振特征表明了交叉的非传统性质，这可能是由于梯子到空间各向异性和受挫的耦合网络中的独特布置而引起的。
We report a novel crossover behavior in the long-range-ordered phase of a prototypical spin-1/2 Heisenberg antiferromagnetic ladder compound (C7H10N)(2)CuBr4. The staggered order was previously evidenced from a continuous and symmetric splitting of (NNMR)-N-14 spectral lines on lowering the temperature below Tc similar or equal to 330 mK, with a saturation towards. 150 mK. Unexpectedly, the split lines begin to further separate away below T* similar to 100mK, while the linewidth and the line shape remain completely invariable. This crossover behavior is further corroborated by the NMR relaxation rate T-1(-1) measurements. A very strong suppression reflecting the ordering, T-1(-1)similar to T-5.5, observed above T*, is replaced by T-1(-1) similar to T below T*. These original NMR features are indicative of the unconventional nature of the crossover, which may arise from a unique arrangement of the ladders into a spatially anisotropic and frustrated coupling network.