Mapping out the Fermi surface of CMR manganites

ORAL

Abstract

The rare-earth manganites have been the subject of intensive research for many years. Despite this attention, many questions still remain, especially regarding the low-temperature ferromagnetic phase that exhibits colossal magnetoresistance (CMR). By applying pulsed magnetic fields of up to 100 T, we have been able to observe two series of magnetic quantum oscillations in the resistivity of high-quality La1-xSrxMnO3 crystals in the CMR phase. The oscillations exhibit frequencies less than 1 kT and their temperature dependence yields effective masses around 2me . These observations suggest that the large “woolsack” Fermi surface sections predicted by bandstructure calculations fragment into smaller pockets at low temperatures, in a manner analogous to the behavior of the Fermi surface of the hole-doped cuprates.

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Presenters

  • John Singleton

    Los Alamos Natl Lab, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Lab NHMFL, NHMFL-LANL, NHMFL at Los Alamos National Lab, NHMFL, Los Alamos Natl Lab, NHMFL - Los Alamos

Authors

  • John Singleton

    Los Alamos Natl Lab, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Lab NHMFL, NHMFL-LANL, NHMFL at Los Alamos National Lab, NHMFL, Los Alamos Natl Lab, NHMFL - Los Alamos

  • Jamie Brambleby

    Physics, Warwick Univ, Physics, Univ of Warwick

  • Paul Goddard

    Physics, Warwick Univ, Physics, Univ of Warwick

  • Dharmalingam Prabhakaran

    Condensed Matter Physics, University of Oxford, Physics Department, University of Oxford, Physics, University of Oxford, Physics , University of Oxford, University of Oxford, Physics, Oxford Univ

  • Anand Bhattacharya

    Argonne National Lab, Materials Science Division, Argonne National Laboratory, Argonne Natl Lab, Material Science Division, Argonne National Laboratory, ANL