Transport properties of the oxides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mi

Gonçalves, A.P.; Santos, Isabel C.; Lopes, Elsa B.; Henriques, R.T.; Almeida, Manuel; Figueiredo, M. Ondina

doi:10.1103/physrevb.37.7476

Cited by 150 publications

(24 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature at which S attains its maximum value also shifts to higher values. The behavior of S observed here is qualitatively similar to that observed by Goncalves et al 6 in Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫ␦ . Obertelli et al 18 observed that the room-temperature value of TEP (S RT ) of various high-T c cuprates follows a universal dependence on the density of holes in the Cu-O planes, p, and T c /T c max in both the underdoped as well as the overdoped regions.…”

Section: Results and Analysissupporting

confidence: 90%

“…3 Figure 4 shows the temperature dependence of resistivity for TBC͑Pr͒CO with xр0. 6. With an increase of Pr concentration, the absolute value of the resistivity in the normal state ( n ) increases and the transition temperature T c ( ϭ0) gradually decreases.…”

Section: Results and Analysismentioning

confidence: 96%

“…It may be pointed out that generally resistivity and TEP data in polycrystalline samples do not agree in the same model, 6 since the heat current is expected to be much less sensitive to the porosity and other weak links present in these samples than the charge current. 18 From this point of view the present samples appear to be less porous and also have grains large in size.…”

Section: /2mentioning

confidence: 95%

“…The magnetic moment of Pr was also found to facilitate pair breaking. Using the resistivity and thermopower data on Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫ␦ , Goncalves et al 6 concluded the band filling to be responsible for suppression of superconductivity in YBCO. From NMR measurements on PrBa 2 Cu 3 O 7 , Reyes et al 7 found hole filling as well as pair breaking to be operative while in (R-Pr)Ba 2 Cu 3 O 7 (RϭSm, Gd, Tm), Malik et al 8 and Xu and Guan 9 found hybridization to dominate.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Localization of charge carriers by Pr in theTl2Ba2Ca1

et al. 2002

View full text Add to dashboard Cite

We have measured the resistivity and thermoelectric power of Tl 2 Ba 2 Ca 1Ϫx Pr x Cu 2 O y samples with xр0.6 in the temperature range 10-300 K. T c decreases with an increase in the Pr concentration and a crossover from a metallic to insulator state is observed in samples with xӍ0.4. In the highly resistive samples (xϾ0.4) conduction is governed by the in-plane variable range hopping of the carriers while in others, localization of bosons appears to be dominating. A ''spin gap'' is observed in the resistivity of these samples. The resistivity and thermoelectric power show the localization of the carriers to increase with an increase in Pr concentration. These data, examined in the light of existing models of conduction by localized carriers, show a preference for the model proposed by Nagaosa and Lee wherein the fermion contribution decreases and that of the bosons increases with the increase in the Pr concentration. The Pr L 3 -edge absorption data show Pr to be present in the mixed (3 ϩ and 4 ϩ ) valent state. Correlating the hole density ''p'' determined from T c and thermoelectric power with the valence of Pr estimated from x-ray-absorption edge measurements, we find hole filling along with hybridization to be the dominant mechanism for destablization and eventual suppression of superconductivity in these materials.

show abstract

Section: Results and Analysissupporting

confidence: 90%

Section: Results and Analysismentioning

confidence: 96%

Section: /2mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Localization of charge carriers by Pr in theTl2Ba2Ca1

et al. 2002

View full text Add to dashboard Cite

show abstract

“…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%

X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

View full text Add to dashboard Cite

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

show abstract

Crystal Structure and Superconductivity of Y1−xPrxBa2Cu3O7−δ Compounds

Cheng

Zhang

et al. 1990

phys. stat. sol. (a)

View full text Add to dashboard Cite

Transport properties of the oxidesY1−xPr

Cited by 150 publications

References 26 publications

Localization of charge carriers by Pr in theTl2Ba2Ca1

Localization of charge carriers by Pr in theTl2Ba2Ca1

X-ray absorption spectroscopy of detwinnedPrxY1−

Crystal Structure and Superconductivity of Y1−xPrxBa2Cu3O7−δ Compounds

Contact Info

Product

Resources

About