Quantum Critical Behavior of Nanoconfined Water Molecules

We have studied terahertz and radio-frequency dielectric response of single water molecules periodically arranged in nano-cages formed by the crystal lattice of beryl. Below ≈20 K, quantum effects start to dominate the properties of the H2O dipolar system as manifested by a crossover between the Cur...

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Bibliographic Details
Main Authors: Zhukova, Elena S., Uykur, Ece, Dressel, Martin, Gorshunov, Boris P., Belyanchikov, Mikhail A., Savinov, Maxim, Bednyakov, Peter, Prokleska, Jan, Kamba, Stanislav, Bedran, Zakhar V., Thomas, Victor G., Torgashev, Victor I.
Format: Conference Proceeding
Language:English
Subjects:
Crystals
Dielectrics
Permittivity
Temperature
Temperature dependence
Temperature measurement
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Summary:We have studied terahertz and radio-frequency dielectric response of single water molecules periodically arranged in nano-cages formed by the crystal lattice of beryl. Below ≈20 K, quantum effects start to dominate the properties of the H2O dipolar system as manifested by a crossover between the Curie-Weiss and the Barrett regimes in the temperature behavior of the dielectric permittivity ε'. Analyzing the temperature evolution of the inverse permittivity (ε') -1 down to T = 0.3 K, we discover signatures of quantum critical behavior of coupled water molecular dipoles: its quadratic variation with temperature at T=3-12 K and a shallow minimum in the (ε') -1 (T) dependence below 3 K.
ISSN:2162-2035
DOI:10.1109/IRMMW-THz.2019.8873791