Superconducting and normal state properties of

Dalichaouch, Y.; Torikachvili, M. S.; Early, E A.; Lee, B.W.; Seaman, C. L.; Yang, Kè; Zhou, Hongyao; Maple, M. B.

doi:10.1016/0038-1098(88)90746-6

Cited by 333 publications

(67 citation statements)

References 9 publications

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“…11, we emphasize that if the holes were residing in the ZR state, transitions from the O 1s core level into the UHB would exhibit little spectral weight due to the transfer of spectral weight from the UHB to the ZR state. 21,58,60,61 In contrast to this, the spectral weight of the UHB should be observed with the same strength as for oxygen-depleted 6.91 compared to their oxygen-depleted counterparts ͑Figs. 9 and 10͒ and is, therefore, attributed to a generally higher degree of hybridization in this energy range, independent of the Pr concentration.…”

Section: Resultsmentioning

confidence: 84%

“…Among those rare-earth-based cuprates that are isostructural to YBa 2 Cu 3 O 7Ϫy , the PrBa 2 Cu 3 O 7Ϫy compound is a puzzling exception since it shows neither metallic nor superconducting behavior. [6][7][8][9][10] Upon substituting Pr into the Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫy system, T c decreases [11][12][13] and, in the case of yϷ0.1, finally vanishes for Pr fractions x beyond 0.55. This transition seems to be accompanied by a change from metallic to semiconducting characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…This approach implies that the suppression of superconductivity results from a reduced number of charge carriers in the CuO 2 planes. Magnetic susceptibility, 6,8,12 Hall effect, 8 thermopower, 7,9,10 nuclear magnetic resonance, 15 muon-spin relaxation, 16 and neutron diffraction measurements [22][23][24] have been interpreted in terms of hole depletion. On closer inspection, however, it has been shown that these results can also be understood as an indication for Pr 3ϩ .…”

Section: Introductionmentioning

confidence: 99%

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X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl) UvA-DARE (Digital Academic Repository)X-ray absorption spectroscopy of detwinned PrxY1-xBa2Cu3O7-y single crystals: electronic structure and hole distribution Merz, M.; Nücker, N.; Pellegrin, E.; Schweiss, P.; Schuppler, S.; Kielwein, M.; Knupfer, M.; Golden, M.S.; Fink, J. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Substituting Y in orthorhombic ͑Y,R)Ba 2 Cu 3 O 7 by any rare-earth element R has generally little effect on the superconducting properties. For RϭPr, however, superconductivity is completely suppressed. To understand this effect we have studied the unoccupied electronic structure of Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫy (xϭ0.0, 0.4, 0.8) using polarization-dependent O 1s near-edge x-ray absorption spectroscopy of detwinned single crystals. We identify the hole states in the CuO 2 planes and the CuO 3 chains and give estimates of the relative contributions of the O 2p x , O 2p y , and O 2p z orbitals to these states. Along with the comparison of oxygen-rich (yϷ0.1) to the oxygen-depleted materials (yϷ0.9), this allows a test of the current theoretical explanations for the Pr-induced suppression of superconductivity. While we can rule out models involving hole filling or charge transfer between the planes and the chains, our data are consistent with approaches based on Pr 4f -O 2p hybridization. ͓S0163-1829͑97͒03313-4͔

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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“…Because the first three properties resemble that of the oxygen depleted phase REBa2Cu306, the suppression of the superconducting state in PrBa2Cu307_y was originally attributed to the filling of the superconducting holes due to a tetravalent or mixed valency of Pr [2]. However, later studies excluded the presence of any Pr 4 § in PrBa2Cu307_y [3].…”

Section: Prba2cu3ot_y Investigated By 141prmentioning

confidence: 99%

PrBa2Cu3O7−y investigated by141Pr Mössbauer spectroscopy

et al. 1994

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“…In particular, RE 1−x Pr x Ba 2 Cu 3 O 7−δ compound has become one of the most studied subjects in the field of high temperature superconductivity. From these studies, it has been observed that increasing Pr substitution in RE 1−x Pr x Ba 2 Cu 3 O 7−δ , causes a monotonically decrease in the critical temperature (T C ) [6]. Some mechanisms such as hole localization [7,8], hole filling [9], magnetic pair breaking [10] and percolation [11] have been proposed to explain the degradation of superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

et al. 2009

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In this work we report on conductivity fluctuation measurements in polycrystalline samples of the Er 1−x Pr x Ba 2 Cu3O 7−δ superconductor (x =0.00, 0.05 and 0.10). Samples were prepared by a standard solidstate reaction technique. The results were analyzed in terms of the temperature derivative of the resistivity and of the logarithmic temperature derivative of the conductivity that allowed the identification of power-law divergences of the conductivity. The results show that the transition proceeds in two stages: pairing and coherence transition. Also, our results, from the critical exponent analysis, show a two-peak splitting at pairing transition, indicating possibly a phase separation. On approaching the zero resistance state, our results show a power-law behavior that corresponds to a phase transition from paracoherent to a coherent state of the granular array.

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Superconducting and normal state properties of

Cited by 333 publications

References 9 publications

X-ray absorption spectroscopy of detwinnedPrxY1−

X-ray absorption spectroscopy of detwinnedPrxY1−

PrBa2Cu3O7−y investigated by141Pr Mössbauer spectroscopy

Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

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