Fincher-Burke spin excitations and ωT scaling in insulating La1.95 Sr0.05 CuO4

Wei Bao, Y. Chen, K. Yamada, A. T. Savici, P. L. Russo, J. E. Lorenzo, Jaiho Chung

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Insulating La1.95 Sr0.05 CuO4 shares with superconducting cuprates the same Fincher-Burke spin excitations, which usually are observed in itinerant antiferromagnets. The local spectral function satisfies ωT scaling above ∼16 K for this incommensurate insulating cuprate, together with previous results in commensurate insulating and incommensurate superconducting cuprates, further supporting the general prediction for square-lattice quantum spin S=12 systems. The width of incommensurate peaks in La1.95 Sr0.05 CuO4 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 partial spin-glass freezing.

Original languageEnglish
Article number180406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number18
DOIs
Publication statusPublished - 2007 Nov 28
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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