Rare-earth valence and doping in T-, T, and T*-phase R2CuO4 (R=rare earths)

Zhengquan Tan, S. M. Heald, S. W. Cheong, A. S. Cooper, J. I. Budnick

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Charge-carrier doping strongly affects the magnetic, transport, and superconducting properties of the T-, T-, and T*-phase R2CuO4 compounds (R=rare earths). The nature of doping and doping level depend not only on the heterovalent cation substitution and oxygen stoichiometry but also on the rare-earth valence. We have studied the valence of various rare earths in the R2CuO4 materials using x-ray-absorption spectroscopy. We found that Ce is tetravalent in both T-phase Nd2-xCexCuO4 and T*-phase Pr2-x-yCexSryCuO4. Pr is trivalent in the T and T structures. In the T* structure, both Pr and Tb have an average valence greater than 3+, very likely arising from an inhomogeneous mixture of trivalent and tetravalent ions, and the latter reside at the eightfold-oxygen-coordinated position. Other rare earths are trivalent in the T, T, and T* phases.

Original languageEnglish (US)
Pages (from-to)2593-2596
Number of pages4
JournalPhysical Review B
Issue number5
StatePublished - 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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