Observation of a low-symmetry crystal structure for superconducting (formula presented) by Ni K-edge x-ray absorption measurements

R. J. Cava, A. Yu Ignatov, L. M. Dieng, T. A. Tyson, T. He

Research output: Contribution to journalArticle

Abstract

The local atomic structure of (formula presented) has been determined over the temperature range of 3 to 300 K by Ni K-edge x-ray absorption fine structure measurements. No anomalies were observed near (formula presented) However, below (formula presented) the symmetry of (formula presented) octahedra is lower than the cubic (formula presented) determined by conventional diffraction measurements. We suggest that the onset of local distortions could be closely related with removal of the degeneracy in the electronic states dominated by the Ni d bands. The results are discussed in relation to nuclear magnetic resonance, x-ray photoemission measurements, and the superconductivity.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number6
DOIs
StatePublished - Feb 28 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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