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arXiv · 1405.3084

Quantum Paraelectric Glass State in SrCu3Ti4O12

Jitender Kumar·Ram Janay Choudhary·A. M. Awasthi
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Abstract

Magnetic and dielectric studies of SrCu3Ti4O12 carried out over 5-300K confirm antiferromagnetic (AFM) ordering of Cu-spins at TN =23K. Dielectric constant ε' measured across 1Hz-1MHz signifies quantum paraelectric character, Barrett-fittable almost down to TN. Competition of athermal fluctuations and the literature-reported magneto-phonon-softening near TN manifests a maiden quantum paraelectric glass (QPG) state. Emergent AFM-field tunes the otherwise quantum ordering (at absolute-zero) of the dipoles to finite-temperature kinetic glass transition; spectral dispersion of dielectric constant unambiguously manifested and characterized. Vogel-Fulcher glass-kinetics parameterization sets the almost relaxation-free QPG state in SrCu3Ti4O12 apart from an emergent scaling-class, to which typical ferroelectric relaxors belong.

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Jitender Kumar, Ram Janay Choudhary, A. M. Awasthi. 2017-07-24. Quantum Paraelectric Glass State in SrCu3Ti4O12. https://doi.org/10.1063/1.4885643

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