Bandwidth narrowing in bulk magnetoresistive oxides

The key structural factor governing the one-electron bandwidth (W) in (A = Ca, Sr) magnetoresistive oxides has been identified by a neutron study. Reducing the size of the lanthanide, the Mn - O bondlength in octahedra does not change () and hence does not contribute to the narrowing of the conduction bandwidth. In contrast, the Mn - O - Mn angle bends at a rate . The calculation of the bandwidth dependence on has been performed and it has been found to be proportional to the measured Curie temperature, both having almost a dependence.