Optical Evidence of Multiphase Coexistence in Single Crystalline   (La,Pr,Ca)MnO3
  We investigated temperature (T)- and magnetic field-dependent optical conductivity spectra (\s\w) of a La_5/8-yPr_yCa_3/8MnO_3 (y~0.35) single crystal, showing intriguing phase coexistence at low T. At T_C < T < T_CO, a dominant charge-ordered phase produces a large optical gap energy of ~0.4 eV. At T < T_C, at least two absorption bands newly emerge below 0.4 eV. Analyses of (\s\w) indicate that the new bands should be attributed to a ferromagnetic metallic and a charge-disordered phase that coexist with the charge-ordered phase. This optical study clearly shows that La_5/8-yPrCa_3/8MnO_3 (y~0.35) is composed of multiphases that might have different lattice strains. 
H. J. Lee, K. H. Kim, M. W. Kim, T. W. Noh (SNU), B. G. Kim, T. Y.   Koo, S.-W. Cheong (RUGERS Univ.), Y. J. Wang, and X. We...