Strong correlation between lattice strains and Curie temperature in La1−x(Ca/Sr)xMnO3

Atomistic simulations have been performed on La1−x(Ca/Sr)xMnO3 to investigate the lattice strains effect on Curie temperature TC upon doping or under pressure. It is found that there is a strong correlation between TC and the lattice strains introduced by doping or pressure. This founding agrees with the results given by Millis et al. [A.J. Millis, T. Darling, A. Migliori, J. Appl. Phys. 83 (1998) 1588] and Tsui et al. [F. Tsui, M.C. Smoak, T.K. Nath, C.B. Eom, Appl. Phys. Lett. 76 (2000) 2421], there was a strong correlation between TC and the lattice strains introduced by substrate mismatch. It is also found that there is a correlation between Curie temperature and local lattice structures (Jahn–Teller distortions). We propose that these two types of correlations we used may have some intrinsic relations.