SEPnet and School of Physics, Queen Mary University of London, London, UK.
J Phys Condens Matter. 2011 Sep 14;23(36):366003. doi: 10.1088/0953-8984/23/36/366003. Epub 2011 Aug 25.
Existing theories explain the spin glass transition in terms of a phase transition and order parameters, and assume the existence of a distinct spin glass phase. In addition to problems related to clarifying the nature of this phase, the common challenge is to explain profound dynamic effects. Here, we propose that the main experimental results of the spin glass transition can be understood in an entirely dynamic picture, without a reference to a distinct spin glass phase, phase transition and order parameters. In this theory, the susceptibility cusp at the glass transition temperature is due to the dynamic crossover between the high-temperature relaxational and low-temperature spin wave regimes. The crossover takes place when t = τ, where t is the observation time and τ is the relaxation time. Time-dependent effects, inconsistent with the phase transition approach, and the logarithmic increase of T(g) with field frequency in particular, originate as the immediate consequence of the proposed picture. In our discussion, we explore similarities between the spin and structural glass transitions.
现有的理论用相变和序参量来解释自旋玻璃转变，并假设存在一个明显的自旋玻璃相。除了与澄清这个相的性质有关的问题外，共同的挑战是解释深刻的动态效应。在这里，我们提出，自旋玻璃转变的主要实验结果可以在完全动态的图景中得到理解，而不需要参考一个明显的自旋玻璃相、相变和序参量。在这个理论中，玻璃转变温度处的磁化率尖峰是由于高温弛豫和低温自旋波区之间的动态交叉。当 t = τ 时，交叉发生，其中 t 是观察时间，τ 是弛豫时间。与相变方法不一致的时间依赖性效应，特别是 T(g)随场频率的对数增加，是所提出的图像的直接结果。在我们的讨论中，我们探讨了自旋和结构玻璃转变之间的相似性。
