Time-dependent structural phenomena at room temperature in quenched YBa2Cu3O6.41

Jorgensen, J. D.; Pei, Shiyou; Lightfoor, P.; Shi, Hao; Paulikas, A. P.; Veal, B. W.

doi:10.1016/0921-4534(90)90676-6

Cited by 364 publications

(130 citation statements)

References 22 publications

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“…These trends (see Fig. 4) reproduce those of the rise in Tc observed experimentally by the Argonne group [41,42]. Moreover, since it is argued that oxygen ordering promotes hole formation, and that oxygen loss destroys holes, these two conflicting tendencies may well produce non-monotonic decay ofTc as oxygen content is decreased, possibly giving rise to the "plateaus" observed in the Tc vs. oxygen content curve.…”

Section: Ordering and Superconductivitysupporting

confidence: 70%

“…45, it was found that Tc increased markedly on subsequent aging, in fact by as much as 27 K [41]. During this process, it was ascertained [42] that oxygen content was not altered: the average occupancy on sites 01, 02, 03, 04 and 05 did not change, although the molar volume and lattice parameters contracted significantly, the a more than the b. Such behavior can only be interpreted as being due to additional oxygen ordering.…”

Section: Ordering and Superconductivitymentioning

confidence: 86%

“…This conjecture received spectacular confInnation in the work of Argonne scientists on oxygen ordering at and below room temperature [41,42]. For quenched YBCO single crystals of oxygen content z=6.…”

Section: Ordering and Superconductivitymentioning

confidence: 99%

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Energetics and Statistics of Order in Alloys with Application to Oxide Superconductors

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Ordering and Disordering in Alloys

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Section: Ordering and Superconductivitysupporting

confidence: 70%

Section: Ordering and Superconductivitymentioning

confidence: 86%

See 1 more Smart Citation

Energetics and Statistics of Order in Alloys with Application to Oxide Superconductors

Fontaine

Ceder

Asta

et al. 1992

Ordering and Disordering in Alloys

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“…Even when the average occupancies of oxygen sites remain constant, the occupation at chain and anti-chain sites can vary. Jorgensen et al [10] observed that the superconducting transition temperature in Y-123 changes as a function of time following the quenching experiment while the oxygen content is fixed. This demonstrates that the specific ordering of the oxygen atoms in the basal plane is another important parameter that controls T c in the Y-123 system [11].…”

Section: Introductionmentioning

confidence: 99%

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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“…Otherwise, it would be the so-called quenching temperature, T q , if a sample were annealed for a long time and then quenched rapidly from T q to room or lower temperature. The role of T R is important: Oxygen atoms in deficient planes do not diffuse below T R (cf, however, the elegant investigation by Jorgensen et al [8]). T q 's have varied up to 350…”

mentioning

confidence: 99%

Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

Uimin

1994

Phys. Rev. B

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In connection with numerous X-ray and neutron investigations of some high temperature superconductors (YBa 2 Cu 3 O 6+x and related compounds) a nontrivial part of the structure factor, coming from partly disordered Cu-O-. . .-O-Cu chain fragments, situated within basal planes, CuO x , can be a subject of theoretical interest. Closely connected to such a diffusive part of the structure factor are the correlation lengths, which are also available in neutron and Xray diffraction studies and depend on a degree of oxygen disorder in a basal plane. The quantitative measure of such a disorder can be associated with temperature of a sample anneal, T q , at which oxygen in a basal plane remains frozen-in high temperature equilibrium after a fast quench of a sample to room or lower temperature. The structure factor evolution with x is vizualized in figures after the numerical calculations. The theoretical approach employed in the paper has been developed for the orthorhombic state of YBCO. 74.70.Vy, 64.60.Cn, 64.80.Eb

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Time-dependent structural phenomena at room temperature in quenched YBa2Cu3O6.41

Cited by 364 publications

References 22 publications

Energetics and Statistics of Order in Alloys with Application to Oxide Superconductors

Energetics and Statistics of Order in Alloys with Application to Oxide Superconductors

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

Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

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