Ordered helium films on highly uniform graphite: finite-size effects, critical parameters, and the three-state Potts model
Ordered helium films on highly uniform graphite: finite-size effects, critical parameters, and the three-state Potts model
复制标题
高度均匀石墨上的有序氦膜：有限尺寸效应、临界参数和三态 Potts 模型
DOI：
10.1103/physrevlett.38.501
复制
发表时间：
1977
影响因子：
8.6
通讯作者：
M. Bretz
中科院分区：
文献类型：
--
作者：
M. Bretz
研究了一种新型石墨衬底上氦薄膜有序化转变的热容，该石墨衬底的微晶排列和横向尺寸是格拉箔衬底的十倍。跃迁峰比在玻璃箔上观察到的要锐利得多，从而可以确定关键参数。=0.36和A/sup+//A/sup-/近似=0.65。阿尔法帽..比最近的二维三态Potts模型计算大得多(其中有序跃迁是唯一的例子)，这增加了有序状态属于新的普适性类的可能性。
The heat capacity of the ordering transition of helium films is studied on a new graphite substrate whose microcrystalline allignment and lateral size are ten times that for Grafoil. Transition peaks are considerably sharper than those observed on Grafoil allowing determination of critical parameters ..cap alpha..approx. =0.36 and A/sup +//A/sup -/ approx. =0.65. The ..cap alpha.. is substantially larger than recent three-state Potts-model calculations in two dimensions (of which the ordering transition is the only example), raising the possibility that the ordered state belongs to a new universality class.