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25 January 2025

» arxiv » cond-mat/0701404

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Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped superconductor La$_{1.895}$Sr$_{0.105}$CuO$_{4}$
J. Chang ; A.P. Schnyder ; R. Gilardi ; H.M. Ronnow ; S. Pailhes ; N.B. Christensen ; Ch. Niedermayer ; D.F. McMorrow ; A. Hiess ; A. Stunault ; M. Enderle ; B. Lake ; O. Sobolev ; N. Momono ; M. Oda ; M. Ido ; C. Mudry ; J. Mesot ;
Date:	17 Jan 2007
Subject:	Superconductivity; Strongly Correlated Electrons
Abstract:	High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La$_{1.895}$Sr$_{0.105}$CuO$_{4}$ (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum-transfer $mathbf{Q}^{ }_{mathrm{IC}}=(0.5,0.5pmdelta,0),(0.5pmdelta,0.5,0)$ 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.
Source:	arXiv, cond-mat/0701404
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