Chang, J; Schnyder, AP; Gilardi, R; Ronnow, HM; Pailhes, S; Christensen, NB; Niedermayer, C; ... Mesot, J; + view all Chang, J; Schnyder, AP; Gilardi, R; Ronnow, HM; Pailhes, S; Christensen, NB; Niedermayer, C; McMorrow, DF; Hiess, A; Stunault, A; Enderle, M; Lake, B; Sobolev, O; Momono, N; Oda, M; Ido, M; Mudry, C; Mesot, J; - view fewer (2007) Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped La1.895Sr0.105CuO4 superconductor. PHYS REV LETT , 98 (7) , Article 077004. 10.1103/PhysRevLett.98.077004.

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Abstract

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.

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