Evidence of a Bond-Nematic Phase in LiCuVO4
Evidence of a Bond-Nematic Phase in LiCuVO4
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DOI：
10.1103/physrevlett.109.027203
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发表时间：
2012-07-13
影响因子：
8.6
通讯作者：
Prokofiev, A.
中科院分区：
文献类型：
--
作者：
Mourigal, M.;Enderle, M.;Prokofiev, A.
对受挫铁磁自旋 1/2 链 LiCuVO4 的极化和非极化中子散射实验表明，8 T H-Q 处的相变是由四极涨落驱动的，并且偶极相关性是短程的，在高场相中矩平行于所施加的磁场。热容测量证明了相变到了高磁场相，其异常现象与低磁场下的异常现象明显不同。我们的实验数据与图一致，其中 H-Q 上方的基态沿着链具有下一个最近邻键向列顺序，并且弱耦合链之间具有流体状相干性。
Polarized and unpolarized neutron scattering experiments on the frustrated ferromagnetic spin-1/2 chain LiCuVO4 show that the phase transition at H-Q of 8 T is driven by quadrupolar fluctuations and that dipolar correlations are short range with moments parallel to the applied magnetic field in the high-field phase. Heat-capacity measurements evidence a phase transition into this high-field phase, with an anomaly clearly different from that at low magnetic fields. Our experimental data are consistent with a picture where the ground state above H-Q has a next-nearest neighbor bond-nematic order along the chains with a fluidlike coherence between weakly coupled chains.