Optical Evidence of Multiphase Coexistence in Single Crystalline (La,Pr,Ca)MnO3

Details Optical Evidence of Multiphase Coexistence in Single Crystalline (La,Pr,Ca)MnO3 Optical Evidence of Multiphase Coexistence in Single Crystalline (La,Pr,Ca)MnO3

2002-03-05

arxiv.org/abs/cond-mat/0203098v1

Phys. Rev. B 65, 115118 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

A single file with 9 figures embedded, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.115118

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.

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