X-ray photoelectron spectroscopy of superconducting RuSr2Eu1.5Ce0.5Cu2O10 and nonsuperconducting RuSr2EuCeCu2O10

U. Manju, V. P. S. Awana, H. Kishan, and D. D. Sarma
Phys. Rev. B 74, 245106 – Published 8 December 2006

Abstract

We report x-ray photoelectron spectroscopic investigation of RuSr2Eu1.5Ce0.5Cu2O10 with ferromagnetic TC100K and a superconducting transition temperature of 30K compared with RuSr2EuCeCu2O10, which is a ferromagnetic (TC150K) insulator. Our results show that the rare earths, Eu and Ce, are in 3+ and 4+ states, respectively. Comparing the Ru core level spectra from these compounds to those from two Ru reference oxides, we also show that Ru in these ruthenocuprates is always in 5+ state, suggesting that the doped holes in the superconducting compound arising from the substitution of Ce4+ by Eu3+ are primarily in the Cu-O plane, in close analogy to all other doped high-TC cuprates. Analysis of Cu 2p spectra in terms of a configuration interaction model provides a quantitative description of the gross electronic structures of these ruthenocuprates.

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  • Received 31 July 2006

DOI:https://doi.org/10.1103/PhysRevB.74.245106

©2006 American Physical Society

Authors & Affiliations

U. Manju1, V. P. S. Awana2, H. Kishan2, and D. D. Sarma1,3,*

  • 1Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560012, India
  • 2Superconductivity and Cryogenics Division, National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India
  • 3Center for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata 700032, India

  • *Also at Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India. Electronic address: sarma@sscu.iisc.ernet.in

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Issue

Vol. 74, Iss. 24 — 15 December 2006

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