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We present a theoretical study on the relation between the size of the rareearth ions, often known as chemical pressure, and the stability of the coherentJahn-Teller distortions in undoped perovskite manganites. Using a Keating modelexpressed in terms of atomic scale symmetry modes, we show that there exists acoupling between the uniform shear distortion and the staggered bucklingdistortion within the Jahn-Teller energy term. It is found that this couplingprovides a mechanism by which the coherent Jahn-Teller distortion is morestabilized by smaller rare earth ions. We analyze the appearance of the uniformshear distortion below the Jahn-Teller ordering temperature, estimate theJahn-Teller ordering temperature and its variation between NdMnO3 and LaMnO3,and obtain the relations between distortions. We find good agreement betweentheoretical results and experimental data.

Effects of rare earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites