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 language | English |
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Pages (from-to) | 862-864 |
Number of pages | 3 |
Journal | Physica B: Physics of Condensed Matter |
Volume | 241-243 |
DOIs | |
State | Published - 1997 |
Externally published | Yes |
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