Behavior of SrTiO3 near the [100]-stress-temperature bicritical point

Abstract

Good polydomain SrTiO3 samples show, for T→Ta+, paramagnetic resonance-linewidth broadening ΔH(T) of the Fe3+-V0 center which is the average of ΔH(T) and ΔH(T) of monodomain samples. Application of [110] and [100] stress on these samples enhances and reduces ΔH(T), respectively. This verifies the Ising and Heisenberg character of the transition in monodomain and annealed samples, respectively. In the Ising monodomain case the correction to the scaling exponent of the order parameter is found to be x>0.5 in agreement with renormalization group theory. © 1975 The American Physical Society.