Burylov S V, Zakhlevnykh A N
Institute of Transport Systems and Technologies, Ukrainian National Academy of Science, 5 Pisargevsky Street, Dnepropetrovsk 49005, Ukraine.
Physics of Phase Transitions Department, Perm State University, 15 Bukirev Street, Perm 614990, Russia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Nov;88(5):052503. doi: 10.1103/PhysRevE.88.052503. Epub 2013 Nov 22.
In the framework of the modified model [S. V. Burylov and A. N. Zakhlevnykh, Phys. Rev. E 88, 012511 (2013)] of soft ferronematic liquid crystals, i.e., suspensions of needlelike ferroparticles in nematic solvents, we consider the ferronematic states with different mutual orientations of the director and magnetization. We study the transitions between states in an external magnetic field and show that these transitions are characterized by either continuous or discontinuous changes in the order parameter; i.e., they can be both the second-order and the first-order, respectively. In the latter case the magnetic field induced orientational hysteresis arises, which can be observed in experiments on the birefringence of ferronematic liquid crystals.
在软铁磁向列型液晶（即针状铁磁颗粒在向列型溶剂中的悬浮液）的改进模型[S. V. 布里洛夫和A. N. 扎赫列夫内赫，《物理评论E》88, 012511 (2013)]框架下，我们考虑指向矢和磁化强度具有不同相互取向的铁磁向列态。我们研究了外磁场中各态之间的转变，并表明这些转变的特征是序参量的连续或不连续变化；也就是说，它们分别既可以是二阶的，也可以是一阶的。在后一种情况下，会出现磁场诱导的取向滞后现象，这可以在铁磁向列型液晶双折射的实验中观察到。
