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Copper Titanates: A Family of Magneto-Quantum Paraelectrics

A magneto-quantum-paraelectric family is emergent from the shared low-temperature characteristics of representative SrCu3Ti4O12 (SCTO), CaCu3Ti4O12 (CCTO), and Ca0.9Li0.1Cu3Ti4O12 (CLCTO) antiferro-tilted/A1/4A'3/4BO3-structures. Above their magnetic ordering temperatures TN, dielectric permittivity of SCTO and CLCTO follow typical quantum paraelectric Barrett-form unambiguously, whereas in CCTO, this behaviour is masked by the huge ε'-step, born of thermally-activated site-antisite (Ca/Cu) disorder. The hidden quantum paraelectricity in CCTO is revealed with Li-doping at Ca-site, by considerable temperature-scale-upshift of the colossal dielectric constant (CDC) anomaly.

preprint2014arXivOpen access

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