Optical Evidence of Multiphase Coexistence in Single Crystalline (La,Pr,Ca)MnO3
H. J. Lee, K. H. Kim, M. W. Kim, T. W. Noh, B. G. Kim, T. Y. Koo, S. -W. Cheong, Y. J. Wang, X. Wei
Abstract
We investigated temperature (T)- and magnetic field-dependent optical conductivity spectra () of a La5/8-yPryCa3/8MnO3 (y~0.35) single crystal, showing intriguing phase coexistence at low T. At TC < T < TCO, a dominant charge-ordered phase produces a large optical gap energy of ~0.4 eV. At T < TC, at least two absorption bands newly emerge below 0.4 eV. Analyses of () 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 La5/8-yPrCa3/8MnO3 (y~0.35) is composed of multiphases that might have different lattice strains.
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