Local Structure and It's Effect on The Ferromagnetic Properties of La$_{0.5}$Sr$_{0.5}$CoO$_3$ thin films}

摘要: We have used high-resolution Extended X-ray Absorption Fine-Structure and diffraction techniques to measure the local structure of strained La$_{0.5}$Sr$_{0.5}$CoO$_3$ films under compression tension. The lattice mismatch strain in these compounds affects both bond lengths angles, though larger effect on bandwidth is due length changes. popular double exchange model for ferromagnetism provides a correct qualitative description changes Curie temperature $T_C$, but quantitatively underestimates A microscopic that much stronger dependence structural distortions needed.