论文标题
重新审视了典型的旋转玻璃的田间冷却状态
The field cooled state of canonical spin-glass revisited
论文作者
论文摘要
规范性旋转玻璃（SG）是凝结物理学中的神秘系统。尽管过去五十年的激烈活动涉及有关SG相过渡的性质和SG基态性质的几个问题，尚未完全解决。在这种背景下，我们重新审视了规范旋转玻璃的田间冷却状态。我们已经在两个典型的自旋玻璃系统（1.8％）和AGMN（1.1％）的实验研究中研究了磁反应，均在田间冷却（FC）以及零场冷却（ZFC）状态中。我们表明，众所周知的磁性记忆效应在FC状态中也存在于SG中ZFC状态的亚稳定性。我们的实验研究结果表明，FC状态也是一个非平衡状态，因此所涉及的能量景观是一种非平衡状态。反过来，这将旋转玻璃转化的图片作为二阶热力学相变。
Canonical spin-glass (SG) is an enigmatic system in condensed matter physics. In spite of the intense activities of last five decades several questions regarding the nature of the SG phase transition and the SG ground state are yet to be resolved completely. In this backdrop we have revisited the field cooled state of canonical spin-glass. We have experimentally studied magnetic response in two canonical spin-glass systems AuMn(1.8%) and AgMn(1.1%), both in the field cooled (FC) as well as zero field cooled (ZFC) state. We show that the well known magnetic memory effect, which clearly established earlier the metastable nature of the ZFC state in SG, is also present in the FC state. The results of our experimental study indicate that the FC state also is a non-equilibrium state, and hence the energy landscape involved is a non-trivial one. This in turn seriously questions the picture of spin-glass transformation as a second order thermodynamic phase transition.
