Transition metal-doped SrTiO3: when does a tiny chemical impact have such a great structural response?

Weak (2 at%) doping of SrTiO 3 by Mn, Ni and Fe leads to radically different changes in structural and dielectric properties, demonstrating clear signs of pseudo Jahn–Teller effect, the first-order Jahn–Teller effect and defect-induced distortion.