Weak ferromagnetism and tricriticality in pure La2CuO4

Tineke Thio, Amnon Aharony

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

New data for the field dependent magnetization M(H) of pure antiferromagnetic La2CuO4 are fitted by a theory which treats the interlayer coupling using mean-field theory (MFT), and includes the Dzyaloshinskii-Moriya coupling. The fits yield a novel measure of the two-dimensional (2D) staggered susceptibility χ2D†, which deviates below 360 K from the 2D Heisenberg model. The fits also imply that the weak-ferromagnetic transition below the Néel point TN is weakly first order, with a tricritical point close to TN. The MFT nicely reproduces the order parameter and the cusp in χ=dMdH.

Original languageEnglish
Pages (from-to)894-897
Number of pages4
JournalPhysical Review Letters
Volume73
Issue number6
DOIs
StatePublished - 1 Jan 1994
Externally publishedYes

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