New Kind of Phase Transition in Randomly Distributed Tunneling Dipoles in Alkali Halides
New Kind of Phase Transition in Randomly Distributed Tunneling Dipoles in Alkali Halides
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碱卤化物中随机分布隧道偶极子的新型相变
DOI：
10.1103/physrevlett.37.756
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
M. W. Klein
中科院分区：
文献类型：
--
作者：
B. Fischer;M. W. Klein
我们证明了分布在碱金属卤化物中的极杂质（例如KCl中的OH−杂质）的浓度非常低，只要平均杂质-杂质相互作用大于单个偶极的隧道分裂能，就会发生相变。该理论预测了介电常数中的温度依赖性尖点。在没有外加电场的情况下，即使在转变温度以下，极化也被预测为零。
We show that very dilute concentrations of dipole impurities distributed in alkali halides (for example, OH− impurities in KCl) undergo a phase transition provided that the average impurity-impurity interaction is greater than the tunnel-splitting energy of a single dipole. This theory predicts a temperature-dependent cusp in the dielectric constant. The polarization in the absence of an applied field is predicted to be zero even below the transition temperature.