Quantum Para-, Ferro-, and Random Electric Behaviors in Oxide Perovskites
- 1 January 1985
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 24 (S2)
- https://doi.org/10.7567/jjaps.24s2.89
Abstract
An introduction to and a survey of quantum para- and ferro-electric behavior in oxide perovskites are given. In the paraelectric case, quantum fluctuations stabilize the disordered state with a high, temperature-independent dielectric constant. Application of uniaxial stress or ion substitution can induce a quantum ferroelectric state at a special quantum multicritical point (QMCP). The occurrence of or crossover to a random-field induced domain state in partially substituted crystals is reviewed. The emphasis is on SrTiO3 studies and on Sr1-x Ca x TiO3 mixed crystals, but contact is made to stressed KTaO3 and substitution of K+ or Ta5+ ionsKeywords
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