Magnetic Field-Induced Closure of the Spin Excitation Gap near Optimal Doping in La2-xSrxCuO4

Niels Bech Christensen, J. Chang, E. Razzoli, M. Bator, C. Niedermayer, K. Lefmann, H.M. Ronnow, D.F. McMorrow, A. Schneidewind, P. Link, A. Hiess, M. Boehm, R. Mottl, S. Pailhes, M. Oda, M. Ido, N. Momono, J. Mesot

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    Abstract

    We have investigated how a magnetic field applied perpendicular to the CuO2 planes of the near-optimally hole-doped high-temperature superconductor La1.855Sr0.145CuO4 (Tc ≈ 36 K) influences the low-energy magnetic excitation spectrum. Our detailed single-crystal neutron scattering experiments reveal that the gap to magnetic excitations falls off linearly with increasing field and reaches zero at the magnetic field µ0Hs=7±1 T required to induce long-range incommensurate magnetic order. A comparison with the electron-doped cuprate Nd1.85Ce0.15CuO4 is made and the possible link between field-induced magnetic order and Fermi surface reconstruction in cuprates is discussed.We have investigated how a magnetic field applied perpendicular to the CuO2 planes of the near-optimally hole-doped high-temperature superconductor La1.855Sr0.145CuO4 (Tc ≈ 36 K) influences the low-energy magnetic excitation spectrum. Our detailed single-crystal neutron scattering experiments reveal that the gap to magnetic excitations falls off linearly with increasing field and reaches zero at the magnetic field µ0Hs=7±1 T required to induce long-range incommensurate magnetic order. A comparison with the electron-doped cuprate Nd1.85Ce0.15CuO4 is made and the possible link between field-induced magnetic order and Fermi surface reconstruction in cuprates is discussed.
    Original languageEnglish
    JournalPhysical Society of Japan. Journal. Supplement
    Volume80
    Pages (from-to)SB030
    ISSN0375-9598
    Publication statusPublished - 2011
    EventInternational Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 - Tokai (JP), 23-26 Feb
    Duration: 1 Jan 2011 → …

    Conference

    ConferenceInternational Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011
    CityTokai (JP), 23-26 Feb
    Period01/01/2011 → …

    Keywords

    • Neutron scattering
    • Magnetic excitations
    • High-temperature superconductors
    • Quantum phase transitions
    • Quantum oscillations

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