Seminar in Fujimori-Mizokawa Group
     In this talk, recent developments in the context of theory and experiments for manganites will be discussed. It will be argued that the presence of nanoscale phase separation is at the heart of the CMR phenomenon [1]. Simulation results and mean-field approximations support this view, as well as plenty of experimental information. These effects are not limited to manganites, but they appear in other compounds as well, such as the high-Tc cuprates. In addition, related physics is present in models of diluted magnetic semiconductors and results will be shown. The overall picture is that ``clustered'' states may be needed as a new paradigm to understand the properties of many interesting materials.