We report the magnetic and electrical characteristics of polycrystalline synthesized at high pressure that is isostructural with acentric (LBO). Piezoresponse force microscopy, optical second harmonic generation, and magnetometry demonstrate ferroelectricity at and below room temperature and weak ferromagnetism below . These results validate symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism in a series of transition metal titanates crystallizing in the LBO structure.
- Received 10 March 2009
©2009 American Physical Society