Optical study of the evolution of charge and spin ordering in the manganese perovskite Bi1-xCaxMn3 (x > 0.5)

H. L. Liu, S. L. Cooper, S. W. Cheong

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We report an optical reflectivity study of charge and spin ordering in Bi1-xCaxMn3 (x = 0.74 and 0.82) single crystals. In the high temperature phase, T < Tco, which is characterized by ferromagnetic correlations, the low-energy contribution to the optical conductivity σ1(ω) is dominated by small polaron dynamics. For Tco < T < TN, the presence of both small polaron and charge-gap-like features signifies “phase separation” behavior in which domains of ferromagnetic and antiferromagnetic order coexist. Below TN, the polaron response is completely suppressed, and a complete charge gap develops, coincident with the onset of long-range antiferromagnetic order.

Original languageEnglish
Pages (from-to)4684-4687
Number of pages4
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 1998 Jan 1


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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