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Title: Quantum paraelectric glass state in SrCu{sub 3}Ti{sub 4}O{sub 12}

Magnetic and dielectric studies of SrCu{sub 3}Ti{sub 4}O{sub 12} carried out over 5–300 K confirm antiferromagnetic (AFM) ordering of Cu-spins at T{sub N} = 23 K. Dielectric constant ε′ measured across 1 Hz-1 MHz signifies quantum paraelectric character, Barrett-fittable almost down to T{sub N}. Competition of athermal fluctuations and the literature-reported magneto-phonon-softening near T{sub N} manifest a 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 was unambiguously manifested and characterized. Vogel-Fulcher glass-kinetics parameterization sets the almost relaxation-free QPG state in SrCu{sub 3}Ti{sub 4}O{sub 12} apart from an emergent scaling-class, to which typical ferroelectric relaxors belong.
Authors:
; ;  [1]
  1. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001 (India)
Publication Date:
OSTI Identifier:
22303901
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; COPPER COMPOUNDS; DIPOLES; DISPERSIONS; FERROELECTRIC MATERIALS; FLUCTUATIONS; GLASS; NEEL TEMPERATURE; OXYGEN COMPOUNDS; PARAELECTRIC RESONANCE; PERMITTIVITY; PHONONS; RELAXATION; SPIN; SPIN GLASS STATE; STRONTIUM COMPOUNDS; TITANIUM COMPOUNDS