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X-ray photoelectron spectroscopy of superconducting $RuSr_2Eu_{1.5}Ce_{0.5}Cu_2O_{10}$ and nonsuperconducting $RuSr_2EuCeCu_2O_{10}$

Manju, U and Awana, VPS and Kishan, H and Sarma, DD (2006) X-ray photoelectron spectroscopy of superconducting $RuSr_2Eu_{1.5}Ce_{0.5}Cu_2O_{10}$ and nonsuperconducting $RuSr_2EuCeCu_2O_{10}$. In: Physical Review B:, 74 (24). pp. 245106-1.

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Abstract

We report x-ray photoelectron spectroscopic investigation of $RuSr_2Eu_{1.5}Ce_{0.5}Cu_2O_{10}$ with ferromagnetic TC\sim100 K and a superconducting transition temperature of $\sim$30 K compared with $RuSr_2EuCeCu_2O_{10}$, which is a ferromagnetic (TC\sim 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 $Ce^{4+}$ by $Eu^{3+}$ are primarily in the Cu-O plane, in close analogy to all other doped high-$T_C$ 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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to the American Physical Society
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Mar 2007
Last Modified: 19 Sep 2010 04:34
URI: http://eprints.iisc.ernet.in/id/eprint/9680

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