X-ray spectroscopic study of the electronic structure of Y1-xPrxBa2Cu3O7

Yamaoka  H; Oohashi  H; Jarrige  ITerashima  TZou  YMizota  HSakakura  STochio  TIto  YSherman  EY

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X-ray spectroscopic study of the electronic structure of Y1-xPrxBa2Cu3O7

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We present a detailed investigation of the bulk electronic properties of Y1-xPrxBa2Cu3O7 (YPrBCO) using x-ray absorption spectroscopy in the partial fluorescence yield mode (PFY-XAS) at Pr L-3, Ba L-3, and Cu K edges together with Pr 2p(3/2)3d(5/2) and Cu 1s2p resonant inelastic x-ray scatterings. Pr L-3 PFY-XAS spectra show that Pr is in the mixed-valence state (with the valence number slightly greater than 3) for the whole x=0.2-1 range, while the Pr valence decreases with increasing x. The decrease of the Pr4+ component upon Pr doping, hinting at a weakening Pr-O hybridization, is inconsistent with the scenario according to which the increase in Pr-O hybridization quenches the superconductivity in YPrBCO for x >= 0.6. It rather suggests that the superconductivity may be suppressed by the total increase of the Pr-related states in the electronic structure due to the Pr ion concentration upon doping. No doping dependence is found in the electronic structure of the Ba and Cu sites, consistent with their invariant environment. No temperature dependence in our data is observed within the experimental accuracy.

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《Physical review, B. Condensed matter and materials physics》 |2008年第4期|045135-1-045135-7-0|共7页
作者
Yamaoka H; Oohashi H; Jarrige ITerashima TZou YMizota HSakakura STochio TIto YSherman EY;
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作者单位

RIKEN, Harima Inst, Inst Phys & Chem Res, Sayo, Hyogo 6795148, Japan;

Natl Inst Mat Sci, Harima Off, Sayo, Hyogo 6795148, Japan;

Japan Atom Energy Agcy, Synchrotron Radiat Res Unit, Mikazuki, Hyogo 6795148, JapanKyoto Univ, Res Ctr Low Temp & Mat Sci, Kyoto 6110011, JapanKyoto Univ, Inst Chem Res, Kyoto 6110011, JapanKeihanna Interact Pl Inc, Kyoto 6190237, JapanUniv Toronto, Dept Phys, Toronto, ON M5S 1A7, CanadaUniv Toronto, Inst Opt Sci, Toronto, ON M5S 1A7, CanadaHigh Energy Accelerator Res Org, Photon Factory, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan;

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正文语种英语
中图分类固体物理学;
关键词
NORMAL-STATE PROPERTIES; SUPERCONDUCTIVITY SUPPRESSION; ABSORPTION-SPECTROSCOPY; HOLE DISTRIBUTION; PR; SYSTEM; RARE; PRBA2CU3O7; VALENCE; GD;

X-ray spectroscopic study of the electronic structure of Y1-xPrxBa2Cu3O7

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