Neutron diffraction and neutron spectroscopic studies of crystalline electric field in AlSr2LnCu2O7 (Ln = Y, Er, Ho)

A. Podlesnyak, A. Mirmelstein, V. Bobrovskii, E. Mitberg, A. Muzychka, E. Khlybov, P. Fischer, A. Furrer

Research output: Contribution to journalArticlepeer-review

Abstract

Investigation of the substitution effects for various sites in the perovskite-like systems with a general formula M1-(Sr, Ba) Ln-(Cu, M2)-O(M = Bi, Tl, Hg, Al, Ga, Zn. Ni and Ln = rare earth) is of great interest in connection with the problem of high- Tc, superconductivity. The 1212 AlSr2LnCu2O7 (Ln = rare earth) compounds, non-superconducting insulating structural analog of the 123 LnBa2Cu3Ox superconductors, exhibit unusual magnetic properties resulting from an interaction between Cu magnetic moments within the CuO2 planes and the rare-earth subsystem. To obtain precise information on the crystal structure neutron powder diffraction measurements have been performed for the 1212 AlSr2LnCu2O7-x (Ln = Y, Er, Ho) compounds. Inelastic neutron scattering has been employed to search for the crystalline-electric-field (CEF) transitions in these compounds. The observed CEF spectra are discussed in terms of the structural model which involves locally inhomogeneous oxygen distribution in the basis planes.

Original languageEnglish
Pages (from-to)862-864
Number of pages3
JournalPhysica B: Physics of Condensed Matter
Volume241-243
DOIs
StatePublished - 1997
Externally publishedYes

Funding

This research was supported by Russian Foundation for Basic Researches (grant No. 96-02-16699), Russian State Programs 'Superconductivity" (grant No. 96-051) and 'Neutron Investigations of Matter' (grants No. 96-104, 96-301). One of us (E.M.) thanks Open Society Institute (grants A96-678, A97-1839).

Keywords

  • Crystalline electric field
  • Neutron diffraction
  • Perovskite compounds

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