[Journal of the Physical Society of Japan Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013) - Tokyo, Japan (August 5-9, 2013)] Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013) - Electronic Structure Evolution of La 0.6 Sr 0.4 Mn 1− y Nb y O 3 across a Metal-Insulator Transition by Nb Doping