Abstract
The temperature (6{endash}350 K) and magnetic-field dependence (0{endash}7.5 T) of the phononic Raman spectra in the layered manganites, R{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} (R=La,Nd), reveal anomalous behaviors of the Mn and equatorial O{sub xy}{sup B{sub 1g}} modes arising from local octahedral distortions and coupling to the Mn{sup 3+} e{sub g} electrons. These results provide the evidence for polaron formation and its interplay with electrical transport and magnetism in the layered manganites. {copyright} {ital 1998} {ital The American Physical Society}
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