The Fincher-Burke spin excitations and omega/T scaling in the insulating 5% Sr-doped La2CuO4

Abstract

Insulating La1.95Sr0.05CuO4 shares with superconducting cuprates the same Fincher-Burke-like spin excitations, which usually are observed in itinerant antiferromagnets. The local spectral function satisfies omega/T scaling above ~16 K for this incommensurate insulating cuprate. Together with previous results in commensurate insulating and incommensurate superconducting cuprates, these results further support the general scaling prediction for square-lattice quantum spin S=1/2 systems. The width of incommensurate peaks in La1.95Sr0.05CuO4 scales to a similar finite value as at optimal doping, strongly suggesting that they are similarly distant from a quantum critical point. They might both be limited to a finite correlation length by the partial spin-glass freezing.

arXiv comment5 pages, 4 figures

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Cited by in corpus (4)

• Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe${}_{0.6}$Se${}_{0.4}$ superconductor
• Magnetic Excitations of the Diagonal Incommensurate Phase in Lightly-Doped La2-xSrxCuO4
• Neutron scattering study of spin ordering and stripe pinning in superconducting La${}_{1.93}$Sr${}_{0.07}$CuO${}_4$
• Diagonal and Collinear Incommensurate Spin Structures in underdoped La${}_{2-x}$Ba${}_x$CuO${}_4$