X-ray spectroscopic study of the electronic structure of Y_1−xPr_xBa₂Cu₃O₇

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H. Yamaoka,¹ H. Oohashi,² I. Jarrige,³ T. Terashima,⁴ Y. Zou,⁵ H. Mizota,⁵ S. Sakakura,⁵ T. Tochio,⁶ Y. Ito,⁵ E. Ya. Sherman,⁷ and A. Kotani^1,8
¹Harima Institute, RIKEN (The Institute of Physical and Chemical Research), Sayo, Hyogo 679-5148, Japan
²Harima Office, National Institute for Materials Science, Sayo, Hyogo 679-5148, Japan
³Synchrotron Radiation Research Unit, Japan Atomic Energy Agency, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
⁴Research Center for Low Temperature and Materials Sciences, Kyoto University, Uji, Kyoto 611-0011, Japan
⁵Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
⁶Keihanna Interaction Plaza Incorporated, Kyoto 619-0237, Japan
⁷Department of Physics and Institute for Optical Sciences, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7
⁸Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

Received 13 September 2007; revised 8 November 2007; published 30 January 2008

Wepresent a detailed investigation of the bulk electronic properties ofY_1−xPr_xBa₂Cu₃O₇ (YPrBCO) using x-ray absorption spectroscopy in the partial fluorescenceyield mode (PFY-XAS) at Pr L₃, Ba L₃, and Cu K edges togetherwith Pr 2p_3/23d_5/2 and Cu 1s2p resonant inelastic x-ray scatterings. Pr L₃ PFY-XASspectra show that Pr is in the mixed-valence state (withthe valence number slightly greater than 3) for the wholex=0.2–1 range, while the Pr valence decreases with increasing x.The decrease of the Pr⁴⁺ component upon Pr doping, hintingat a weakening Pr-O hybridization, is inconsistent with the scenarioaccording to which the increase in Pr-O hybridization quenches thesuperconductivity in YPrBCO for x0.6. It rather suggests that thesuperconductivity may be suppressed by the total increase of thePr-related states in the electronic structure due to the Prion concentration upon doping. No doping dependence is found inthe electronic structure of the Ba and Cu sites, consistentwith their invariant environment. No temperature dependence in our datais observed within the experimental accuracy.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.77.045135
DOI:	10.1103/PhysRevB.77.045135
PACS:	75.30.Mb; 61.05.cj; 71.20.Eh; 78.70.Ck 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena in magnetically ordered materials 61.05.cj X-ray absorption spectroscopy (condensed matter structure determination) 71.20.Eh Electronic structure of crystalline rare earth metals and alloys 78.70.Ck X-ray scattering (condensed matter) YEAR: 2008
KEYWORDS:	barium compounds, doping, high-temperature superconductors, mixed valence compounds, praseodymium compounds, X-ray absorption spectra, X-ray scattering, yttrium compounds

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