量子自旋梯中具有吸引力的汤川-卢津液体。
Attractive Tomonaga-Luttinger liquid in a quantum spin ladder.
机构信息
Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UJF, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France.
Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zurich, Zurich 8093, Switzerland.
出版信息
Phys Rev Lett. 2013 Sep 6;111(10):106404. doi: 10.1103/PhysRevLett.111.106404. Epub 2013 Sep 5.
We present NMR measurements of a strong-leg spin-1/2 Heisenberg antiferromagnetic ladder compound (C7H10N)2CuBr4 under magnetic fields up to 15 T in the temperature range from 1.2 K down to 50 mK. From the splitting of NMR lines, we determine the phase boundary and the order parameter of the low-temperature (three-dimensional) long-range-ordered phase. In the Tomonaga-Luttinger regime above the ordered phase, NMR relaxation reflects characteristic power-law decay of spin correlation functions as 1/T1∝T(1/2K-1), which allows us to determine the interaction parameter K as a function of field. We find that field-dependent K varies within the 1<K<2 range, which signifies attractive interaction between the spinless fermions in the Tomonaga-Luttinger liquid.
我们在磁场高达 15 T 的条件下对强磁相互作用的自旋-1/2 海森堡反铁磁梯状化合物 (C7H10N)2CuBr4 进行了核磁共振测量，温度范围从 1.2 K 到 50 mK。通过对核磁共振谱线的分裂，我们确定了低温（三维）长程序相的相界和序参量。在有序相上方的 Tomonaga-Luttinger 区，核磁共振弛豫反映了自旋关联函数的特征幂律衰减，即 1/T1∝T(1/2K-1)，这使我们能够确定作为磁场函数的相互作用参数 K。我们发现，依赖于磁场的 K 值在 1<K<2 的范围内变化，这表明在 Tomonaga-Luttinger 液体中的无自旋费米子之间存在吸引力相互作用。
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