Fingerprints of Critical Phenomena in a Quantum Paraelectric Ensemble of Nanoconfined Water Molecules.
Fingerprints of Critical Phenomena in a Quantum Paraelectric Ensemble of Nanoconfined Water Molecules.
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DOI：
10.1021/acs.nanolett.2c00638
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发表时间：
2022-04
期刊：
影响因子：
10.8
通讯作者：
M. Belyanchikov;M. Savinov;P. Proschek;J. Prokleška;E. Zhukova;V. Thomas;Z. Bedran;F. Kadlec
中科院分区：
文献类型：
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作者：
M. Belyanchikov;M. Savinov;P. Proschek;J. Prokleška;E. Zhukova;V. Thomas;Z. Bedran;F. Kadlec
我们已经研究了射频介电响应的系统组成的独立的极性水分子周期性地排列在纳米笼形成的晶格的宝石绿柱石。在T = 20-30 K以下，量子效应开始主导电偶极系统的性质，如由温度依赖的真实的介电常数ε ′（T）中的居里-外斯和巴雷特状态之间的交叉所表现的。当详细分析互易介电常数（ε '）-1下降到T <$0.3 K的温度演化并将其与传统量子顺电体（如SrTiO 3、KTaO 3）获得的数据进行比较时，我们发现了相互作用的水分子偶极子的量子临界行为的清晰特征：在T = 6和14 K之间，介电常数的倒数遵循二次温度依赖性，并在3 K以下显示出浅的最小值。这是第一次观察到的“介电指纹”的量子临界现象的耦合点电偶极子的顺电系统。
We have studied the radio frequency dielectric response of a system consisting of separate polar water molecules periodically arranged in nanocages formed by the crystal lattice of the gemstone beryl. Below T = 20-30 K, quantum effects start to dominate the properties of the electric dipolar system as manifested by a crossover between the Curie-Weiss and the Barrett regimes in the temperature-dependent real dielectric permittivity ε'(T). When analyzing in detail the temperature evolution of the reciprocal permittivity (ε')-1 down to T ≈ 0.3 K and comparing it with the data obtained for conventional quantum paraelectrics, like SrTiO3, KTaO3, we discovered clear signatures of a quantum-critical behavior of the interacting water molecular dipoles: Between T = 6 and 14 K, the reciprocal permittivity follows a quadratic temperature dependence and displays a shallow minimum below 3 K. This is the first observation of "dielectric fingerprints" of quantum-critical phenomena in a paraelectric system of coupled point electric dipoles.