Kurta R P, Ostrovskii B I, Singer A, Gorobtsov O Y, Shabalin A, Dzhigaev D, Yefanov O M, Zozulya A V, Sprung M, Vartanyants I A
Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Oct;88(4):044501. doi: 10.1103/PhysRevE.88.044501. Epub 2013 Oct 14.
We present an x-ray study of liquid crystal membranes in the vicinity of the hexatic-smectic phase transition by means of angular x-ray cross-correlation analysis. By applying two-point angular-intensity cross-correlation functions to the measured series of diffraction patterns the parameters of bond-orientational (BO) order in hexatic phase were directly determined. The temperature dependence of the positional correlation lengths was analyzed as well. The obtained correlation lengths show larger values for the higher-order Fourier components of BO order. These findings indicate a strong coupling between BO and positional order.
我们通过角X射线互相关分析对近六方相-近晶相转变附近的液晶膜进行了X射线研究。通过将两点角强度互相关函数应用于测量的一系列衍射图案，直接确定了六方相中键取向（BO）序的参数。还分析了位置相关长度的温度依赖性。所获得的相关长度对于BO序的高阶傅里叶分量显示出更大的值。这些发现表明BO序和位置序之间存在强耦合。
