Mukherjee Prabir K
Department of Physics, Presidency College, 86/1 College Street, Kolkata 700 073, India.
J Chem Phys. 2009 Jun 7;130(21):214906. doi: 10.1063/1.3148380.
We examine the effect of pressure on the rotator-II (R(II)) to rotator-I (R(I)) (R(II)-R(I)) transition within Landau phenomenological theory. The influence of pressure on the R(II)-R(I) transition is discussed by varying the coupling between the lattice distortion and the area/molecule. The pressure dependence of the area/molecule and the lattice distortion are calculated near the R(II)-R(I) transition. The R(II)-R(I) transition is found to be first order even at elevated pressure. The Landau coefficients are calculated from the experimental data. The theoretical results are in good agreement with available experimental results.
我们在朗道唯象理论框架下研究了压力对旋转体-II（R(II)）到旋转体-I（R(I)）（R(II)-R(I)）转变的影响。通过改变晶格畸变与面积/分子之间的耦合来讨论压力对R(II)-R(I)转变的影响。在R(II)-R(I)转变附近计算了面积/分子和晶格畸变的压力依赖性。结果发现，即使在高压下，R(II)-R(I)转变仍是一级相变。从实验数据计算出朗道系数。理论结果与现有实验结果吻合良好。
