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Publication Detail
Magnetic-Field-Induced Soft-Mode Quantum Phase Transition in the High-Temperature Superconductor La1.855Sr0.145CuO4: An Inelastic Neutron-Scattering Study
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Chang J, Christensen NB, Niedermayer C, Lefmann K, Ronnow HM, McMorrow DF, Schneidewind A, Link P, Hiess A, Boehm M, Mottl R, Pailhes S, Momono N, Oda M, Ido M, Mesot J
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    01/05/2009
  • Journal:
    PHYS REV LETT
  • Volume:
    102
  • Issue:
    17
  • Print ISSN:
    0031-9007
  • Language:
    EN
  • Keywords:
    SPIN, DYNAMICS, STATE, GAP, ORDER
  • Addresses:
    Chang, J
    ETH
    Neutron Scattering Lab
    CH-5232
    Villigen
    Switzerland

    PSI
    CH-5232
    Villigen
    Switzerland

    Univ Copenhagen
    Niels Bohr Inst
    Nanosci Ctr
    DK-2100
    Copenhagen
    Denmark

    Ecole Polytech Fed Lausanne
    Lab Quantum Magnetism
    CH-1015
    Lausanne
    Switzerland

    UCL
    Dept Phys & Astron
    London
    England
Abstract
Inelastic neutron-scattering experiments on the high-temperature superconductor La1.855Sr0.145CuO4 reveal a magnetic excitation gap Delta that decreases continuously upon application of a magnetic field perpendicular to the CuO2 planes. The gap vanishes at the critical field required to induce long-range incommensurate antiferromagnetic order, providing compelling evidence for a field-induced soft-mode driven quantum phase transition.
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