Oxygen stoichiometry, superconductivity and normal-state properties of YBa2Cu3O7–δ

Cava, R. J.; Batlogg, B.; Chen, C. H.; Rietman, Edward A.; Zahurak, S. M.; Werder, D. J.

doi:10.1038/329423a0

Cited by 527 publications

(102 citation statements)

References 4 publications

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“…In addition, the distribution (ordering) of oxygen atoms among the atomic sites strongly affects T c . The order-disorder transition of chain-oxygen has been extensively studied both experimentally and theoretically [8,9,12,13,14,15]. Raman studies show that there exists a pressure-induced ordering phenomenon [19].…”

Section: Chain-oxygen Order-disorder Transitionmentioning

confidence: 99%

“…It has been determined experimentally that the orthorhombicto-tetragonal phase transition in the RE-123 series take place at an oxygen composition in the range of 6.4 (Er) to 6.83 (Nd), not all at 6.5 (Y) [20,21,22]. The change of oxygen content leads to the change of structure such as lattice parameters and atomic positions [8,9], which in turn alters the formation energy of Frenkel pairs. Since we set the reference transition temperature to be the value in Y-123 case, this corresponds to the transition at oxygen content being 6.5.…”

Section: Chain-oxygen Order-disorder Transitionmentioning

confidence: 99%

“…Oxygen ordering in the Cu-O chains of the 123 structure gives rise to further complex structures [8,9]. Even when the average occupancies of oxygen sites remain constant, the occupation at chain and anti-chain sites can vary.…”

Section: Introductionmentioning

confidence: 99%

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Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds

Welch

Wong‐Ng³

2004

Phys. Rev. B

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The energetics of Schottky defects in 123 cuprate superconductor series, REBa2Cu3O7 (where RE = lanthandies) and YAE2Cu3O7 (AE = alkali-earths), were found to have unusual relations if one considers only the volumetric strain. Our calculations reveal the effect of non-uniform changes of interatomic distances within the RE-123 structures, introduced by doping homovalent elements, on the Schottky defect formation energy. The energy of formation of Frenkel Pair defects, which is an elementary disordering event, in 123 compounds can be substantially altered under both stress and chemical doping. Scaling the oxygen-oxygen short-range repulsive parameter using the calculated formation energy of Frenkel pair defects, the transition temperature between orthorhombic and tetragonal phases is computed by quasi-chemical approximations (QCA). The theoretical results illustrate the same trend as the experimental measurements in that the larger the ionic radius of RE, the lower the orthorhombic/tetragonal phase transition temperature. This study provides strong evidence of the strain effects on order-disorder transition due to oxygens in the CuO chain sites.

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Section: Chain-oxygen Order-disorder Transitionmentioning

confidence: 99%

Section: Chain-oxygen Order-disorder Transitionmentioning

confidence: 99%

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Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds

Welch

Wong‐Ng³

2004

Phys. Rev. B

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“…In a magnetic field the sample showed in comparison with a variety of other samples high levitation indicating a large MeiBner effect. Using the relation between oxygen content and lattice parameters reported by Cava et al [25] we found that the sample had the composition YBa2Cu307+6 where 6=0.1_+0.1. A large oxygen concentration, with 6>0, may be responsible for a value of T~ (~-86 K) smaller than values (~-94 K) known for samples with 6 <0.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Far-infrared reflectivity of sintered YBa2Cu3O7 in the normal and superconducting state

Ose

Obermayer

Otto

et al. 1988

Z. Physik B - Condensed Matter

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We report on a study of the far-infrared reflection for a sintered YBa2Cu30 7 sample that contained a large portion of preferentially oriented crystallites with the a-b plane parallel to the surface and that showed extraordinary high far-infrared reflectivity. From experimental reflection data we determined, by Kramers-Kronig analysis, the dynamical conductivity and extracted the contributions due to free charge carriers and phonons, respectively. We find evidence for an anomalous behavior of the dynamical conductivity at temperatures above T~; the dynamical conductivity increases strongly for temperatures approaching T~ and is strongly frequency dependent. By use of the Mattis-Bardeen theory we obtain an estimate for the superconducting energy gap of 2A/kT~_4.6 (for T< T~).We find that the lowest frequency infrared-active phonon mode is less damped in the superconducting state than in the normal state.

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“…Expression (2) allows for the effect of hydrostatic pressure on the thermodynamic properties of phase, but for an accurate determination of the parameters W ri , l ri and j ri in (3), volume measurements at different T and P are needed. These data were usually calculated from the values of the crystal lattice parameters determined by means of XRD [14,17,18,21,[30][31][32][33][34][35] or NDA [16]. From these results crystal thermal expansion coefficients, compressibility, or bulk modulus can be also derived.…”

Section: Volume and Elastic Propertiesmentioning

confidence: 99%

Thermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution (Technical Report)

Voronin

2000

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgment, with full reference to the source, along with use of the copyright symbol ©, the name IUPAC, and the year of publication, are prominently visible. Publication of a translation intoThermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution Abstract: The aim of this report is to inform the chemical community about a selfconsistent thermodynamic data set for the YBa 2 Cu 3 O 6+z (1 ≥ z ≥ 0) solid solution, that is well known as the Y123 phase and possesses superconducting properties at z~1 and low temperatures. About 3300 experimental points obtained in 240 miscellaneous experiments published in 78 papers have been processed simultaneously in order to obtain the most reliable Gibbs energy function of the Y123 phase in the temperature range from 250 to 1300 K and pressures up to 100 kbar. A function is recommended for approximation of the Gibbs energy, which has 16 adjustable parameters. All other thermodynamic properties of the Y123 solution, including the conditions for its internal stability, can be derived from the assessed Gibbs energy. Brief descriptions of the thermodynamic model, experimental and data assessment methods as well as examples of self-consistent thermodynamic data applications are given.

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Oxygen stoichiometry, superconductivity and normal-state properties of YBa2Cu3O7–δ

Cited by 527 publications

References 4 publications

Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds

Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds

Far-infrared reflectivity of sintered YBa2Cu3O7 in the normal and superconducting state

Thermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution (Technical Report)

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