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

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

2007-04-09

arxiv.org/abs/0704.1161v3

Phys. Rev. B vol. 76, 180406(R) (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.180406

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.

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