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

We present an inelastic light scattering study of single crystalline (La $_{1 - y}$ Pr $_{y}$ ) $_{1 - x}$ Sr $_{x}$ MnO $_{3}$ ( $0 \leq x \leq 0.14$ , $y = 0$ and $x = 1 / 8$ , $0 \leq y \leq 0.5$ ). 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.

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

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

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Existence of orbital polarons in ferromagnetic insulating La1−x1−x​Srxx​MnO33​ (0.11<x<<x<0.14) evidenced by giant phonon softening

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Existence of orbital polarons in ferromagnetic insulating La1−x1−x​Srxx​MnO33​ (0.11<x<<x<0.14) evidenced by giant phonon softening

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

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

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