Abstract
Due to their rather simple crystal structure, the infinite-layer (IL) compounds have attracted much interest as a favorable system for the study of mechanisms of the electron or hole doping of the CuO 2 planes in the high- T c superconductors. Crystalline electric field (CEF) investigation of high- T c superconductors provides direct evidence of the charge transfer process, since the rare-earth ion serves as a local probe for the effective charge associated with the superconducting CuO 2 planes. Inelastic neutron scattering has been employed to search for CEF transitions in the Sr 0.87Nd 0.13CuO 2 compound produced by a high-pressure technique. The observed energy spectra at T = 10 K exhibit two well-defined inelastic lines at 14.9, 19.5 meV and very weak scattering of magnetic origin around 41 and 80 meV associated with the Nd 3+ ions in the IL phase. Based on the present results as well as on a well-established extrapolation scheme possible CEF energy spectra for the IL phase are discussed.
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