X-ray absorption spectroscopy of Pr{sub x}Y{sub 1-x}Ba{sub 2}Cu{sub 3}O{sub 7-y} single crystals

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768410· OSTI ID:457188

Merz, M; Nuecker, N; Pellegrin, E; Schuppler, S ^[1]

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1. Forschungszentrum Karlsruhe, Dresden (Germany); and others

Substituting Y in orthorhombic (Y,RE)Ba{sub 2}Cu{sub 3}O{sub 7} by any rare-earth element RE has generally little effect on the superconducting properties. For RE = Pr, however, superconductivity is completely suppressed. To elucidate this effect the authors have studied the unoccupied electronic structure of Pr{sub x}Y{sub 1{minus}x}Ba{sub 2}Cu{sub 3}O{sub 7{minus}y} (x = 0.0, 0.4, 0.8) by polarization-dependent O1s x-ray absorption spectroscopy on detwinned single crystals. Along with the comparison of undoped (y {approx} 0.9) to the doped materials (y {approx} 0.1), this allows a test of the current theoretical explanations for the suppression of superconductivity. While the authors can rule out models involving hole filling or charge transfer from planes to chains the authors data is consistent with approaches based on Pr4f-O2p{sub {pi}} hybridization.

• Sponsoring Organization: USDOE
• OSTI ID: 457188
• Report Number(s): CONF-960808--; CNN: Contract SCI CT91-0751. V.C.
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
BARIUM OXIDES
COPPER OXIDES
DOPED MATERIALS
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
PROMETHIUM OXIDES
SUPERCONDUCTIVITY
YTTRIUM OXIDES