Valence band study of Sm$_{0.1}$Ca$_{0.9-x}$Sr$_{\mathrm{x}}$MnO$_{3}$ using high resolution photoemission spectroscopy*

We have studied the valence band electronic structure of Sm$_{0.1}$Ca$_{\mathrm{0.9-x}}$Sr$_{\mathrm{x}}$MnO$_{3}$ (x $=$ 0, 0.1, 0.3 and 0.6) at various temperatures using high resolution photoemission spectroscopy (HRPES). The data were taken using a Scienta R4000 energy analyser and the resolution was set at 5 meV. The doping dependent studies of Sm$_{0.1}$Ca$_{\mathrm{0.9-x}}$Sr$_{\mathrm{x}}$MnO$_{3}$ at 50 K, 100 K and 295 K are quite interesting. The density of e$_{\mathrm{g}}$ states near the Fermi level decreases with Sr substitution at the Ca site at 50 K. Also the similar trend has been observed at 100 K. At 295 K the changes in the e$_{\mathrm{g}}$ states is quite different than the earlier temperatures where the intensity remains the same for x $=$ 0, 0.1 and 0.3 and then decreases for x $=$ 0.6. These changes in the density of states near the Fermi level will be explained by taking into account the structural, electrical and magnetic properties associated with this system.