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High-resolution neutron inelastic scattering experiments in applied magneticfields have been performed on La$_{1.895}$Sr$_{0.105}$CuO$_{4}$ (LSCO). In zerofield, the temperature dependence of the low-energy peak intensity at theincommensurate momentum-transfer $\mathbf{Q}^{\}_{\mathrm{IC}}=(0.5,0.5\pm\delta,0),(0.5\pm\delta,0.5,0)$ exhibits an anomalyat the superconducting $T^{\}_{c}$ which broadens and shifts to lowertemperature upon the application of a magnetic field along the c-axis. Afield-induced enhancement of the spectral weight is observed, but only atfinite energy transfers and in an intermediate temperature range. Theseobservations establish the opening of a strongly downward renormalized spin gapin the underdoped regime of LSCO. This behavior contrasts with the observeddoping dependence of most electronic energy features.Comment: accepted for publication in Phys. Rev. Let

physical review letters

Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.895</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>0.105</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Superconductor

Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the UnderdopedLa1.895Sr0.105CuO4Superconductor