Romanini M, Tamarit J L, Pardo L C, Bermejo F J, Fernandez-Perea R, Pratt F L
Grup de Caracterizacio de Materials, Departament de Fisica, ETSEIB, Universitat Politecnica de Catalunya, Diagonal 647, 08028 Barcelona, Catalonia, Spain.
J Phys Condens Matter. 2017 Mar 1;29(8):085405. doi: 10.1088/1361-648X/aa530d. Epub 2017 Jan 17.
The transition taking place between two metastable phases in 2-O-adamantane, namely the [Formula: see text] cubic, rotator phase and the lower temperature P2/c, Z = 4 substitutionally disordered crystal is studied by means of muon spin rotation and relaxation techniques. Measurements carried out under zero, weak transverse and longitudinal fields reveal a temperature dependence of the relaxation parameters strikingly similar to those exhibited by structural glass[Formula: see text]liquid transitions (Bermejo et al 2004 Phys. Rev. B 70 214202; Cabrillo et al 2003 Phys. Rev. B 67 184201). The observed behaviour manifests itself as a square root singularity in the relaxation rates pointing towards some critical temperature which for amorphous systems is located some tens of degrees above that shown as the characteristic transition temperature if studied by thermodynamic means. The implications of such findings in the context of current theoretical approaches concerning the canonical liquid-glass transition are discussed.
利用μ子自旋旋转和弛豫技术研究了2-氧代金刚烷中两个亚稳相之间的转变，即[化学式：见原文]立方旋转相和较低温度的P2/c，Z = 4替代无序晶体。在零场、弱横向场和纵向场下进行的测量表明，弛豫参数的温度依赖性与结构玻璃[化学式：见原文]液体转变所表现出的依赖性惊人地相似（Bermejo等人，2004年，《物理评论B》70卷，214202页；Cabrillo等人，2003年，《物理评论B》67卷，184201页）。观察到的行为表现为弛豫率中的平方根奇异性，指向某个临界温度，对于非晶系统，该临界温度比通过热力学方法研究时显示的特征转变温度高几十度。讨论了这些发现对当前关于典型液-玻璃转变的理论方法的影响。
