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Experiment and theory of Pb(In$$_{1/2}$$Nb$$_{1/2}$$)O$$_{3}$$; Antiferroelectric, ferroelectric, or relaxor state depending on perovskite B-site randomness

Owada, Kenji; Tomita, Yusuke*

We have reviewed the effect of B-site randomness in PIN from the experimental and theoretical viewpoints. Lattice dynamics measured in ordered and disordered PINs represent the existence of ferroelectric (FE) instability regardless of B-site randomness. It shows the coexistence of FE and antiferroelectric (AFE) instabilities in PIN. B-site randomness controls the balance between FE and AFE instabilities. We constructed a minimal model that includes dipolar interaction and easy-axis anisotropy which depends on B-site randomness. The results from Monte Carlo simulations show that the model well reproduces the phase diagram and the dielectric constant of PIN qualitatively.



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Category:Physics, Multidisciplinary



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