Impurity states and magnetic order in layered copper oxides (invited)

K. M. Rabe, Ravindra N. Bhatt

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

The influence of impurity potentials on vacancies in the t-J model is studied through the exact diagonalization of systems with 8 and 16 sites. For a wide range of model parameters, the ground state transforms according to the two-dimensional vector representation of C4v and has S =1/2. The inclusion of symmetry breaking effects present for an isolated impurity in an infinite system yields an anisotropic ground state which may couple to local lattice distortions. Implications for magnetic order, spectroscopy, and the metal-insulator transition in the CuO2 planes of the cuprate superconductors are discussed. The relationship to the behavior of free vacancies and the role of finite size effects are considered. A mean-field Hubbard model analysis is proposed as a supplementary approach.

Original languageEnglish (US)
Pages (from-to)4508-4512
Number of pages5
JournalJournal of Applied Physics
Volume69
Issue number8
DOIs
StatePublished - Dec 1 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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