Title: A review on magnetic field induced spin crossover in LaCoO$_{3}$ up to 600 T Show Chinese title

Title: LaCoO$_{3}$中磁场诱导的自旋交叉研究综述（高达 600 T）

Abstract: \lco{} is known for its two-step spin crossover as a function of temperature. Despite efforts spanning over half a century, the origin of this phenomenon is still debated, particularly regarding how the microscopic spin states are involved in the observed macroscopic two-step spin crossover. High magnetic field studies on LaCoO$_{3}$ are performed because the magnetic field-induced spin crossover is induced, where the magnetic excited states become more stable in high magnetic fields than the non-magnetic ground states. This review focuses on the findings in LaCoO$_{3}$ at high magnetic fields over the last decade. A complex phase diagram has been revealed at high magnetic fields instead of solving the conventional problem of LaCoO$_{3}$. It suggests that appreciable spin state correlations are in play in LaCoO$_{3}$. The possibility of exciton condensation is also discussed. Show Chinese abstract

Abstract: \lco{}因其温度相关的两步自旋交叉而闻名。尽管经过了半个世纪的努力，这一现象的起源仍存在争议，特别是关于微观自旋态如何参与观察到的宏观两步自旋交叉的问题。由于磁场诱导的自旋交叉，开展了针对LaCoO$_{3}$的高磁场研究，在这种情况下，磁激发态在高磁场中比非磁性基态更为稳定。 本文综述了过去十年来LaCoO$_{3}$在高磁场下的研究成果。在高磁场下揭示了一个复杂的相图，而非解决LaCoO$_{3}$的常规问题。这表明在LaCoO$_{3}$中存在显著的自旋态关联。此外还讨论了激子凝聚的可能性。