Dispersion and energy spectrum of spin excitations in an underdoped La_1.90Sr_0.10CuO_4

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dc.creatorKofu, M.
dc.creatorYokoo, T.
dc.creatorTrouw, F.
dc.creatorYamada, K.
dc.date2007-10-30
dc.date.accessioned2026-07-07T08:39:38Z
dc.date.available2026-07-07T08:39:38Z
dc.descriptionWe performed inelastic neutron experiments on underdoped La_2-xSr_xCuO_4(x=0.10, T_c=28.6K) using a time-of-flight neutron scattering technique. Four incommensurate peaks on the two-dimensional reciprocal plane disperse inwards toward an antiferromagnetic zone center as the energy increases. These peaks merge into a single peak at an energy E_cross around w=40+-3meV. Beyond E_cross, the peak starts to broaden and ``hourglass-like'' excitations are observed. The E_cross in the underdoped sample is smaller than that reported for the optimally doped La_1.84Sr_0.16CuO_4. The reduction of the E_cross is explained by the doping-independent slope of the downward dispersion below the E_cross combined with the smaller incommensurability in the underdoped sample. In the energy spectrum of chi"(w), we observed a similar "peak-dip-hump" structure in the energy region of 10~45meV to that reported for the optimally doped sample. We discuss the relation between the hourglass-shaped dispersion and the peak-dip-hump energy spectrum.
dc.description4pages, 3figures. submitted to PRB Rapid Communications. submitted to PRB Rapid Communications
dc.identifierhttps://arxiv.org/abs/0710.5766
dc.identifierhttp://arxiv.org/abs/0710.5766
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/141142
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleDispersion and energy spectrum of spin excitations in an underdoped La_1.90Sr_0.10CuO_4
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