Existence of orbital polarons in ferromagnetic insulating La$_{1-x}$Sr$_x$MnO$_{3}$ (0.11$<x<$0.14) evidenced by giant phonon softening

A. Revcolevschi; B. B\"uchner; G. G\"untherodt; K.-Y. Choi; L. Pinsard-Gaudart; P. Lemmens; P. Reutler; V. P. Gnezdilov; Yu. G. Pashkevich

arxiv: cond-mat/0401185 · v1 · pith:BKESDVCGnew · submitted 2004-01-12 · ❄️ cond-mat.str-el

Existence of orbital polarons in ferromagnetic insulating La_(1-x)Sr_xMnO₃ (0.11<x<0.14) evidenced by giant phonon softening

K.-Y. Choi , P. Lemmens , G. G\"untherodt , Yu. G. Pashkevich , V. P. Gnezdilov , P. Reutler , L. Pinsard-Gaudart , B. B\"uchner

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A. Revcolevschi

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keywords giantsofteningbreathingferromagneticinsulatingleq0modeorbital

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We present an inelastic light scattering study of single crystalline (La$_{1-y}$Pr$_y$)$_{1-x}$Sr$_{x}$MnO$_3$ ($0\leq x\leq0.14$,$y=0$ and $x=1/8$,$0\leq y\leq0.5$). A giant softening up to 20 - 30 cm$^{-1}$ of the Mn-O breathing mode has been observed only for the ferromagnetic insulating (FMI) samples ($0.11\leq x \leq 0.14$) upon cooling below the Curie temperature. With increasing Pr-doping the giant softening is gradually suppressed. This is attributed to a coupling of the breathing mode to orbital polarons which are present in the FMI phase.

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Existence of orbital polarons in ferromagnetic insulating La_(1-x)Sr_xMnO₃ (0.11<x<0.14) evidenced by giant phonon softening

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