Neutron spectroscopic studies of crystalline electric field in infinite-layer Sr1-xNdxCuO2

A. Podlesnyak, A. Mirmelstein, V. Bobrovskii, B. Goshchitskii, E. Mitberg, A. Muzychka, I. Sashin, R. Eccleston, J. Mesot, M. Zolliker, S. Rosenkranz, W. Henggeler, A. Furrer

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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 CuO2 planes in the high-Tc superconductors. Crystalline electric field (CEF) investigation of high-Tc 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 CuO2 planes. Inelastic neutron scattering has been employed to search for CEF transitions in the Sr0.87Nd0.13CuO2 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 Nd3+ 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.

Original languageEnglish
Pages (from-to)794-796
Number of pages3
JournalPhysica B: Physics of Condensed Matter
Volume234-236
DOIs
StatePublished - Jun 2 1997
Externally publishedYes

Funding

This research was supported by the Russian Foundation for Basic Researches (Grant No. 96-02-16699-a) and the Russian Scientific Council on High-To Problems (Project No. 93001). We are grateful to the ILL, Grenoble and JINR, Dubna for providing infrastructure facilities.

Keywords

  • Crystal fields
  • High-T superconductors
  • Perovskite compounds

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