Quantum Paraelectric Glass State in SrCu3Ti4O12
Jitender Kumar, Ram Janay Choudhary, and A.M. Awasthi
TL;DR
This study reveals a novel quantum paraelectric glass state in SrCu3Ti4O12, characterized by quantum fluctuations, magnetic ordering, and dielectric behavior, distinct from typical ferroelectric relaxors, with tunable glass transition properties.
Contribution
The paper reports the discovery of a quantum paraelectric glass state in SrCu3Ti4O12, combining magnetic and dielectric analyses to identify unique quantum and glassy phenomena.
Findings
Antiferromagnetic ordering at 23K confirmed.
Quantum paraelectric behavior observed down to TN.
Identification of a quantum paraelectric glass state with unique relaxation properties.
Abstract
Magnetic and dielectric studies of SrCu3Ti4O12 carried out over 5-300K confirm antiferromagnetic (AFM) ordering of Cu-spins at TN =23K. Dielectric constant {\epsilon}' 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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