Strong effect of magnetic ordering on single crystals Ln(1-x)SrxMnO3 (x=0.1; 0.2; 0.3) optical spectra

The red shift of fundamental absorption edge (~0.16 eV) of single crystal La_0.9Sr_0.1MnO₃ occurs as the crystal is cooled into the ferromagnetic phase. Result shows that there exist spin-dependent states. The reflection and absorption spectra of single crystals La_0.9Sr_0.1MnO₃ (x=0.1, 0.2, 0.3) indicate that the red shift may be the reason of appearance of free charge carriers participating in the colossal magnetoresistence phenomenon. The nonmetal-metal type transition below T_c confirms it.