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

Manju, U. ; Awana, V. P. S. ; Kishan, H. ; Sarma, D. D. (2006) X-ray photoelectron spectroscopy of superconducting RuSr2Eu1.5Ce0.5Cu2O10 and nonsuperconducting RuSr2EuCeCu2O10 Physical Review B: Condensed Matter and Materials Physics, 74 (24). 245106_1-245106_7. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v74/i24/e245106

Related URL: http://dx.doi.org/10.1103/PhysRevB.74.245106

Abstract

We report x-ray photoelectron spectroscopic investigation of RuSr2Eu1.5Ce0.5Cu2O10 with ferromagnetic TC~100 K and a superconducting transition temperature of ~30 K compared with RuSr2EuCeCu2O10, which is a ferromagnetic (TC~150 K) 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-TCcuprates. Analysis of Cu 2p spectra in terms of a configuration interaction model provides a quantitative description of the gross electronic structures of these ruthenocuprates.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:46427
Deposited On:04 Jul 2011 12:09
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