Magnetic excitation spectra in the field induced quantum phases of the quasi-1D Ising-like antiferromagnet SrCo2V2O8

We propose to investigate the magnetic excitation spectra in the three accessible magnetic ordered phases of the quasi-1D S-1/2 Ising-like antiferromagnet SrCo2V2O8 by single crystal inelastic neutron scattering using the LET. The magnetic phase diagram [for H // (001)] exhibits a series of field-induced quantum phase transitions as a function of field and temperature (below ~ 1.5 K), from AFM ground state to incommensurate longitudinal spin density wave state (AFM-II) at 3.7 T, and then to a second ordered quantum state (AFM-III) at ~ 7 T. We wish to investigate the development of the spinon continuum and bound states and to investigate how they are transformed in the two field-induced longitudinal spin density wave phases. Outcomes of the proposed investigations are expected to give experimental verification of the theoretical predictions.我们提出采用LET仪器开展单晶体非弹性中子散射实验，研究准一维自旋1/2类伊辛（Ising）反铁磁体SrCo₂V₂O₈的三种可观测磁有序相中的磁激发谱。当磁场沿(001)晶向时，其磁相图展现出一系列随磁场与温度（低于约1.5 K）变化的场诱导量子相变：从反铁磁基态出发，在3.7 T处转变为非公度纵向自旋密度波态（AFM-II），随后在约7 T处进入第二种有序量子态（AFM-III）。本研究旨在探究自旋子连续谱与束缚态的演化过程，以及它们在两种场诱导纵向自旋密度波相中发生的转变机制。本项研究的预期成果将为相关理论预测提供实验验证。