Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening

K. Y. Choi; P. Lemmens; T. Sahaoui; G. Güntherodt; Yu G. Pashkevich; V. P. Gnezdilov; P. Reutler; L. Pinsard-Gaudart; B. Büchner; A. Revcolevschi

doi:10.1103/PhysRevB.71.174402

Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening

K. Y. Choi, P. Lemmens, T. Sahaoui, G. Güntherodt, Yu G. Pashkevich, V. P. Gnezdilov, P. Reutler, L. Pinsard-Gaudart, B. Büchner, A. Revcolevschi

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Abstract

We present an inelastic light scattering study of single crystalline (La1-y Pry) 1-x Srx Mn O3 (0x0.14, y=0 and x=1/8, 0y0.5). 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 (0.11x0.14) upon cooling below the Curie temperature (TC). With increasing Pr-doping the giant softening is strongly suppressed. This is attributed to a coupling of the breathing mode to orbital polarons, which are present in the FMI state. Moreover, the softening that persists to lowest temperature without saturation suggests a continuous, temperature-dependent evolution of orbital polarons below TC.

Original language	English
Article number	174402
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	71
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.71.174402
State	Published - 2005
Externally published	Yes

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Choi, K. Y., Lemmens, P., Sahaoui, T., Güntherodt, G., Pashkevich, Y. G., Gnezdilov, V. P., Reutler, P., Pinsard-Gaudart, L., Büchner, B., & Revcolevschi, A. (2005). Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening. Physical Review B - Condensed Matter and Materials Physics, 71(17), Article 174402. https://doi.org/10.1103/PhysRevB.71.174402

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title = "Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening",

abstract = "We present an inelastic light scattering study of single crystalline (La1-y Pry) 1-x Srx Mn O3 (0x0.14, y=0 and x=1/8, 0y0.5). 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 (0.11x0.14) upon cooling below the Curie temperature (TC). With increasing Pr-doping the giant softening is strongly suppressed. This is attributed to a coupling of the breathing mode to orbital polarons, which are present in the FMI state. Moreover, the softening that persists to lowest temperature without saturation suggests a continuous, temperature-dependent evolution of orbital polarons below TC.",

author = "Choi, \{K. Y.\} and P. Lemmens and T. Sahaoui and G. G{\"u}ntherodt and Pashkevich, \{Yu G.\} and Gnezdilov, \{V. P.\} and P. Reutler and L. Pinsard-Gaudart and B. B{\"u}chner and A. Revcolevschi",

year = "2005",

doi = "10.1103/PhysRevB.71.174402",

language = "English",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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Choi, KY, Lemmens, P, Sahaoui, T, Güntherodt, G, Pashkevich, YG, Gnezdilov, VP, Reutler, P, Pinsard-Gaudart, L, Büchner, B & Revcolevschi, A 2005, 'Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening', Physical Review B - Condensed Matter and Materials Physics, vol. 71, no. 17, 174402. https://doi.org/10.1103/PhysRevB.71.174402

TY - JOUR

T1 - Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening

AU - Choi, K. Y.

AU - Lemmens, P.

AU - Sahaoui, T.

AU - Güntherodt, G.

AU - Pashkevich, Yu G.

AU - Gnezdilov, V. P.

AU - Reutler, P.

AU - Pinsard-Gaudart, L.

AU - Büchner, B.

AU - Revcolevschi, A.

PY - 2005

Y1 - 2005

N2 - We present an inelastic light scattering study of single crystalline (La1-y Pry) 1-x Srx Mn O3 (0x0.14, y=0 and x=1/8, 0y0.5). 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 (0.11x0.14) upon cooling below the Curie temperature (TC). With increasing Pr-doping the giant softening is strongly suppressed. This is attributed to a coupling of the breathing mode to orbital polarons, which are present in the FMI state. Moreover, the softening that persists to lowest temperature without saturation suggests a continuous, temperature-dependent evolution of orbital polarons below TC.

AB - We present an inelastic light scattering study of single crystalline (La1-y Pry) 1-x Srx Mn O3 (0x0.14, y=0 and x=1/8, 0y0.5). 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 (0.11x0.14) upon cooling below the Curie temperature (TC). With increasing Pr-doping the giant softening is strongly suppressed. This is attributed to a coupling of the breathing mode to orbital polarons, which are present in the FMI state. Moreover, the softening that persists to lowest temperature without saturation suggests a continuous, temperature-dependent evolution of orbital polarons below TC.

UR - https://www.scopus.com/pages/publications/28544451687

U2 - 10.1103/PhysRevB.71.174402

DO - 10.1103/PhysRevB.71.174402

M3 - Article

AN - SCOPUS:28544451687

SN - 1098-0121

VL - 71

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 17

M1 - 174402

ER -

Existence of orbital polarons in ferromagnetic insulating La1-x Srx MnO3 (0.11 x 0.14) revealed by giant phonon softening

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