Existence of orbital polarons in ferromagnetic insulating La1xSrxMnO3 (0.11x0.14) 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, and A. Revcolevschi
Phys. Rev. B 71, 174402 – Published 3 May 2005

Abstract

We present an inelastic light scattering study of single crystalline (La1yPry)1xSrxMnO3 (0x0.14, y=0 and x=18, 0y0.5). A giant softening up to 2030cm1 of the MnO 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.

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  • Received 13 December 2004

DOI:https://doi.org/10.1103/PhysRevB.71.174402

©2005 American Physical Society

Authors & Affiliations

K.-Y. Choi1,2, P. Lemmens3,4, T. Sahaoui2, G. Güntherodt2, Yu. G. Pashkevich5, V. P. Gnezdilov6, P. Reutler7, L. Pinsard-Gaudart7, B. Büchner8, and A. Revcolevschi7

  • 1Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
  • 22. Physikalisches Institut, RWTH Aachen, 52056 Aachen, Germany
  • 3Max Planck Institute for Solid State Physics, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 4Institute for Physics of Condensed Matter, TU Braunschweig, D-38106 Braunschweig, Germany
  • 5A. A. Galkin Donetsk Phystech NASU, 83114 Donetsk, Ukraine
  • 6B. I. Verkin Institute for Low Temperature Physics NASU, 61164 Kharkov, Ukraine
  • 7Laboratoire de Physico-Chimie, Université Paris-Sud, 91405 Orsay, France
  • 8Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany

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Vol. 71, Iss. 17 — 1 May 2005

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