An 17O NMR study of PrBa2Cu3O7−δ

Ko, Young Chun; Kweon, Hk; Lee, H.C.; Hur, Nam Hwi

doi:10.1016/0921-4534(94)90272-0

Cited by 8 publications

(12 citation statements)

References 25 publications

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“…This conclusion is corroborated by NMR data 63,64 where no changes for the O͑4͒ and Cu͑1͒ sites were detected. Thus, it can be concluded that the number of holes on the apical O͑4͒ site remains unaffected by Pr substitution while the decrease of O͑1͒ holes is responsible for the 14% reduction of the chain holes.…”

Section: B Comparison With Current Modelssupporting

confidence: 77%

“…The peak of the Eʈc absorption spectrum amounting in total to 0.31 holes would then be composed of a FR component and a component due to the apical oxygen which implies that 0.21 holes would correspond to the FR state and only 0.10 holes would be left on the apical O͑4͒ site. Since we can exclude such a small number of holes on the apical O͑4͒ site if optical 32,62 and NMR data 15,18,63,64 are taken into account, this places an extra and quite tough constraint on the FR state, which cannot be reconciled with the original FR approach ͑45°rotation of the O 2p orbitals͒.…”

Section: B Comparison With Current Modelsmentioning

confidence: 99%

“…This small decrease of holes on the chain sites is in accordance with recent optical investigations 62 where a reduction by about 14% of the amount of holes residing on the CuO 3 chains was reported. Furthermore, NMR and nuclear quadrupole resonance ͑NQR͒ data 15,18,63,64 have shown that for a fixed oxygen concentration the electric field gradients at the Cu͑1͒ and at the apical O͑4͒ site remain almost unchanged, regardless of the R substituent in RBa 2 Cu 3 O 7Ϫy . Therefore, a substantial charge transfer in connection with the apical O͑4͒ site can be excluded.…”

Section: A Electronic Structure Of Prmentioning

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: B Comparison With Current Modelssupporting

confidence: 77%

Section: B Comparison With Current Modelsmentioning

confidence: 99%

Section: A Electronic Structure Of Prmentioning

confidence: 99%

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X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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“…29 The EFG is a traceless symmetric tensor of rank 2, defined as the second derivative of the electrostatic potential ͑with respect to spatial coordinates͒ evaluated at the position of the nucleus. The EFG at the oxygen sites of RBa 2 Cu 3 O 7−␦ systems can be measured very accurately by the 17 O NMR spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

Different self-consistent electronic structures ofPrBa2Cu3O7fromLSDA
Ghanbarian
¹

2008
Phys. Rev. B
11
1
9
0
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Based on the density-functional theory and using the full-potential linearized augmented-plane-wave method the electronic structure of PrBa 2 Cu 3 O 7 ͑Pr123͒ system was calculated. The rotationally invariant local spindensity approximation plus Hubbard parameter U was employed for Pr͑4f͒ orbitals. One self-consistent solution more stable than the previous solution, which has been proposed by Liechtenstein and Mazin ͑LM͒ ͓Phys. Rev. Lett. 74, 1000 ͑1995͔͒, was found. This new solution favors the suggestion that the pure Pr123 samples should be intrinsically superconductor and metal similar to the other RBa 2 Cu 3 O 7 ͑R = Y or a rare-earth ele-ment͒ samples. Moreover, the results of 17 O NMR spectroscopy study of the conventional nonsuperconducting Pr123 samples ͓Y. H. Ko et al., Physica C 224, 357 ͑1994͔͒ were interpreted by means of our new solution. It was argued that the loss of superconductivity in the conventional Pr123 samples should be associated with transition of holes from O2͑2p ͒ orbitals to O2͑2p ͒ orbitals. Altogether, it was proposed that some imperfections can be responsible for this phenomenon. Meanwhile, more pieces of evidence are required to verify this proposal.

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“…As a result, they found that there is a more stable solution (missed by Liechtenstein and Mazin [13]) which favors intrinsic superconductivity of pure Pr-123 samples. Their findings can also explain the loss of superconductivity observed in 17 O NMR spectroscopy study of the conventional non-superconducting Pr-123 samples [25]. They argue that this phenomenon is caused by the forced transition of holes from O2(2p ) orbitals to O2(2p ) orbitals.…”

Section: Introductionmentioning

confidence: 92%

Comparative study on structure and magnetic properties of polycrystalline PrxY1−xBa2Cu3O7−δ prepared in oxygen and argon atmosphere

Stari

Cichetto

Peres

et al. 2012

Journal of Alloys and Compounds

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An 17O NMR study of PrBa2Cu3O7−δ

Cited by 8 publications

References 25 publications

X-ray absorption spectroscopy of detwinnedPrxY1−

X-ray absorption spectroscopy of detwinnedPrxY1−

Different self-consistent electronic structures ofPrBa2Cu3O7fromLSDA
Ghanbarian
¹

2008
Phys. Rev. B
11
1
9
0
View full text Add to dashboard Cite

Comparative study on structure and magnetic properties of polycrystalline PrxY1−xBa2Cu3O7−δ prepared in oxygen and argon atmosphere

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An 17O NMR study of PrBa2Cu3O7−δ

Cited by 8 publications

References 25 publications

X-ray absorption spectroscopy of detwinnedPrxY1−

X-ray absorption spectroscopy of detwinnedPrxY1−

Different self-consistent electronic structures ofPrBa2Cu3O7fromLSDAGhanbarian1 2008Phys. Rev. B11190View full textAdd to dashboardCite

Comparative study on structure and magnetic properties of polycrystalline PrxY1−xBa2Cu3O7−δ prepared in oxygen and argon atmosphere

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Different self-consistent electronic structures ofPrBa2Cu3O7fromLSDA
Ghanbarian
¹

2008
Phys. Rev. B
11
1
9
0
View full text Add to dashboard Cite