Time-dependent superconducting behavior of oxygen-deficient<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></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">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:ma

Veal, B. W.; You, Hoydoo; Paulikas, A. P.; Shi, Hao; Fang, Y.; Downey, J.W.

doi:10.1103/physrevb.42.4770

Cited by 209 publications

(70 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%

“…For quenched YBCO single crystals of oxygen content z=6. 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.…”

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%

See 2 more Smart Citations

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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Section: Ordering and Superconductivitysupporting

confidence: 70%

Section: Ordering and Superconductivitymentioning

confidence: 86%

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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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“…To tune the oxygen content to a particular value y, we first attached three pairs of electrical contacts on each crystal, using EPO-TEK H20E silver epoxy, and then sealed the crystals in a quartz tube with crushed polycrystalline YBCO previously prepared with the desired y. The crystals (of thicknesses 10-30 m) were initially annealed at 550°C for a week, and then slowly cooled (at 30°C͞h) to 150°C, and held there for 3 weeks to optimize chain ordering (11,15). The final cooling to 25°C takes Ϸ12 h (we did not de-twin any of the crystals).…”

Section: Resultsmentioning

confidence: 99%

Particle-hole symmetry in the antiferromagnetic state of the cuprates

Wang

Ong

2001

Proc. Natl. Acad. Sci. U.S.A.

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In the layered cuprate perovskites, the occurrence of high-temperature superconductivity seems deeply related to the unusual nature of the hole excitations. The limiting case of a very small number of holes diffusing in the antiferromagnetic (AF) background may provide important insights into this problem. We have investigated the transport properties in a series of crystals of YBa2Cu3Oy, and found that the temperature dependencies of the Hall coefficient RH and thermopower S change abruptly as soon as the AF phase boundary is crossed. In the AF state at low temperatures T, both RH and S are unexpectedly suppressed to nearly zero over a broad interval of T. We argue that this suppression arises from near-exact symmetry in the particle-hole currents. From the trends in RH and S, we infer that the symmetry is increasingly robust as the hole density x becomes very small (x Ӎ 0.01). We discuss implications for electronic properties both within the AF state and outside.I n the layered cuprate perovskites, high-temperature superconductivity appears when a moderate density of holes are introduced into the CuO 2 planes by chemical doping. The parent (undoped) compound is a Mott insulator with a spin-1 ⁄2 moment residing on each Cu ion in the plane. Below the Néel temperature, long-range, three-dimensional (3D) antiferromagnetism is stable. The introduction of holes destroys the static 3D antiferromagnetic (AF) order, and superconductivity appears when the relative hole population x exceeds Ϸ0.05 per Cu ion. In the quest to understand cuprate superconductivity, it has long been recognized that determining the nature of the itinerant hole moving in a sea of disordered spin-1 ⁄2 moments with short-range AF order is an essential step. Because semiclassical approximations are not reliable for this spin-1 ⁄2 system, the problem has remained intractable despite a decade of theoretical effort (1-6). In the dilute limit (x Ͻ 0.05), the hole has been variously described as a ''holon'' moving in a resonating valence bond liquid (1), or an excitation dressed with a spiral spin-current backflow (2), or as a charge trailing a phase string (4).In this limit, the signals from the itinerant carriers become increasingly difficult to resolve from background signals, especially in experiments that ''see'' all of the valence electrons in the sample. Transport experiments, which probe directly the itinerant holes without background problems, would appear to have a valuable role to play. To date, however, the available transport data in the very underdoped limit come almost entirely from the single-layer cuprate La 2-x Sr x CuO 4 (LSCO). The resistivity and Hall results in LSCO do not appear to be qualitatively different from those in the moderately underdoped regime (0.05 Ͻ x Ͻ 0.13; refs. 7 and 8). However, because doping by Sr substitution creates strong disorder, there is good reason to suspect that results in LSCO reflect the properties of the disorder-dominated CuO 2 plane.Doping-induced disorder is much less of a factor in the bilayer ...

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“…Single crystals of antiferromagnetic Y Ba 2 Cu 3 O 6.25 were grown by a method described elsewhere [1]. Typical dimensions are 0.8x0.5x0.04 mm 3 with the c-axis of the single crystals oriented along the smallest dimension.…”

Section: Methodsmentioning

confidence: 99%

Magnetotransport properties of antiferromagnetic YBa2Cu3O6.25 single crystals

Cimpoiasu¹,

Paulikas²,

Veal³

et al. 2001

Physica C: Superconductivity and its Applications

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In-plane ∆ρ ab /ρ ab and out-of-plane ∆ρ c /ρ c magnetoresistivities of antiferromagnetic Y Ba 2 Cu 3 O 6.25 single crystals were measured in magnetic fields H applied along the ab plane. ∆ρ ab /ρ ab is a superposition of two components: The first component is strongly in-plane anisotropic, changing sign from negative when H I to positive when H ⊥ I. The second component is positive, quadratic in H, and isotropic in the ab-plane. ∆ρ c /ρ c displays a fourfold symmetry upon in-plane rotation of the magnetic field, with maxima along the easy axes of antiferromagnetic spin ordering and minima along unfavorable directions of spin orientation (45 0 from the Cu − O − Cu bonds).

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Time-dependent superconducting behavior of oxygen-deficientYBa2Cu3

Cited by 209 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

Particle-hole symmetry in the antiferromagnetic state of the cuprates

Magnetotransport properties of antiferromagnetic YBa2Cu3O6.25 single crystals

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