Inelastic neutron scattering study of the anisotropic S=1 spin chain [Ni(HF2)(3−Clpyridine)4]BF4
Inelastic neutron scattering study of the anisotropic S=1 spin chain [Ni(HF2)(3−Clpyridine)4]BF4
复制标题
DOI：
10.1103/physrevb.101.094431
复制
发表时间：
2020-01
影响因子：
3.7
通讯作者：
D. Pajerowski;J. Manson;J. Herbrych;J. Bendix;A. Podlesnyak;J. M. Cain;M. Meisel
中科院分区：
文献类型：
--
作者：
D. Pajerowski;J. Manson;J. Herbrych;J. Bendix;A. Podlesnyak;J. M. Cain;M. Meisel
[Ni（HF$_2$）（3-Cl pyridine）$_4$]BF$_4$（NBCT）是一种一维自旋链材料，在0.1K以下没有磁中子布拉格峰。以前的工作确定NBCT是在Haldron阶段和附近的量子相变作为一个功能的$D/J$的大-$D$量子顺磁相（QPM），其中$D$是轴向单离子各向异性和$J$是链内超交换。在此，非弹性中子散射的结果，部分氘，$^{11}$B富集NBCT多晶样品在零磁场和低至0.3 K的温度。与密度矩阵重正化群计算的结果相比，得到$D/J = 1.51$和显著的菱形单离子各向异性$E$（$E/D \approximately 0.03$，$E/J \approximately 0.05$）。这些$D$，$J$和$E$值将NBCT置于大-$D$ QPM阶段，但急剧接近量子相变到长程有序阶段。
[Ni(HF$_2$)(3-Clpyridine)$_4$]BF$_4$ (NBCT) is a one-dimensional, $S = 1$ spin chain material that shows no magnetic neutron Bragg peaks down temperatures of 0.1 K. Previous work identified NBCT to be in the Haldane phase and near a quantum phase transition as a function of $D/J$ to the large-$D$ quantum paramagnet phase (QPM), where $D$ is the axial single-ion anisotropy and $J$ is the intrachain superexchange. Herein, inelastic neutron scattering results are presented on partially deuterated, $^{11}$B enriched NBCT polycrystalline samples in zero magnetic field and down to temperatures of 0.3 K. Comparison to density matrix renormalization group calculations yields $D/J = 1.51$ and a significant rhombic single-ion anisotropy $E$ ($E/D \approx 0.03$, $E/J \approx 0.05$). These $D$, $J$, and $E$ values place NBCT in the large-$D$ QPM phase but precipitously near a quantum phase transition to a long-range ordered phase.