Switchable Polarization in an A-Site Deficient Perovskite through Vacancy and Cation Engineering - Suguru Yoshida; Olivier Hernandez; Jinsuke Miyake; Kei Nakayama; Ryo Ishikawa; Hajime Hojo; Yuichi Ikuhara; Venkatraman Gopalan; Katsuhisa Tanaka; Koji Fujita (Journal of the American Chemical Society, 2026)