Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped La1895Sr0105CuO4 superconductor

J. Chang, A.P. Schnyder, R. Gilardi, H.M. Rønnow, S. Pailhes, Niels Bech Christensen, C. Niedermayer, D.F. McMorrow, A. Hiess, A. Stunault, M. enderle, B. Lake, O. Sobolev, N. Momono, M. Oda, M. Ido, C. Mudry, J. Mesot

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    High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La1.895Sr0.105CuO4 (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q(IC)=(0.5,0.5 +/-delta,0),(0.5 +/-delta,0.5,0) exhibits an anomaly at the superconducting T-c which broadens and shifts to lower temperature upon the application of a magnetic field along the c axis. A field-induced enhancement of the spectral weight is observed, but only at finite energy transfers and in an intermediate temperature range. These observations establish the opening of a strongly downward renormalized spin gap in the underdoped regime of LSCO. This behavior contrasts with the observed doping dependence of most electronic energy features.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number7
    Pages (from-to)077004
    Publication statusPublished - 2007

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    Copyright 2007 American Physical Society

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