The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu1.5Ce0.5RuSr2Cu2O10

I. Felner*, U. Asaf, C. Godart, E. Alleno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

The superconducting (Tc ∼ 32 K) Eu1.5Ce0.5RuSr2Cu2O10 (Ru-2122) material is also magnetically ordered (TM ∼ 122 K) with TM » Tc. Superconductivity (SC) is confined to the CuO2 planes, whereas magnetism is due to the Ru sublattice. Mossbauer spectroscopy performed at 90 and 300 K on 151Eu shows a single narrow line with an isomer shift = 0.69(2) and a quadrupole splitting of 1.84 mm/s, indicating that the Eu ions are trivalent with a nonmagnetic J = 0 ground state. This is in agreement with X-ray-absorption spectroscopy (XAS) taken at LIII edges of Eu, Ce which shows that Eu is trivalent and Ce is tetravalent. XAS experiments at the K edge of Ru indicate that Ru is pentavalent. This indicates, that in the M-2122 system, SC exists only for pentavalent M ions such as Ta, Nb and Ru.

Original languageEnglish
Pages (from-to)703-704
Number of pages2
JournalPhysica B: Condensed Matter
Volume259-261
DOIs
StatePublished - 1999

Keywords

  • Magnetism
  • Mossbauer spectroscopy
  • Superconductivity
  • X-ray absorption spectroscopy

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