Fermi Surface of Three-Dimensional La1xSrxMnO3 Explored by Soft-X-Ray ARPES: Rhombohedral Lattice Distortion and its Effect on Magnetoresistance

L. L. Lev, J. Krempaský, U. Staub, V. A. Rogalev, T. Schmitt, M. Shi, P. Blaha, A. S. Mishchenko, A. A. Veligzhanin, Y. V. Zubavichus, M. B. Tsetlin, H. Volfová, J. Braun, J. Minár, and V. N. Strocov
Phys. Rev. Lett. 114, 237601 – Published 9 June 2015
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Abstract

Electronic structure of the three-dimensional colossal magnetoresistive perovskite La1xSrxMnO3 has been established using soft-x-ray angle-resolved photoemission spectroscopy with its intrinsically sharp definition of three-dimensional electron momentum. The experimental results show much weaker polaronic coupling compared to the bilayer manganites and are consistent with the theoretical band structure including the empirical Hubbard parameter U. The experimental Fermi surface unveils the canonical topology of alternating three-dimensional electron spheres and hole cubes, with their shadow contours manifesting the rhombohedral lattice distortion. This picture has been confirmed by one-step photoemission calculations including displacement of the apical oxygen atoms. The rhombohedral distortion is neutral to the Jahn-Teller effect and thus polaronic coupling, but affects the double-exchange electron hopping and thus the colossal magnetoresistance effect.

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  • Received 11 November 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.237601

© 2015 American Physical Society

Authors & Affiliations

L. L. Lev1,2,*, J. Krempaský1, U. Staub1, V. A. Rogalev1, T. Schmitt1, M. Shi1, P. Blaha3, A. S. Mishchenko4,2, A. A. Veligzhanin2, Y. V. Zubavichus2, M. B. Tsetlin2, H. Volfová5, J. Braun5, J. Minár5,6, and V. N. Strocov1,†

  • 1Swiss Light Source, Paul Scherrer Institute, 5232 Villigen, Switzerland
  • 2National Research Centre “Kurchatov Institute”, 123182 Moscow, Russia
  • 3Institut für Materialchemie, Technische Universität Wien, A-1060 Wien, Austria
  • 4RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 5Department Chemie, Ludwig-Maximilians-Universität München, 81377 Munich, Germany
  • 6New Technologies-Research Center, University of West Bohemia, 306 14 Plzen, Czech Republic

  • *lll_ru@mail.ru
  • vladimir.strocov@psi.ch

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Vol. 114, Iss. 23 — 12 June 2015

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