A new superconductor obtained by electrochemical oxidation of La2CuO4

Grenier, J.‐C.; Wattiaux, Alain; Lagueyte, N.; Park, J. C.; Marquestaut, E.; Étourneau, J.; Pouchard, Michel

doi:10.1016/0921-4534(91)90360-b

Cited by 150 publications

(60 citation statements)

References 20 publications

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“…Further research dealing with La CuO oxidation demonstrated that oxygen intercalation into oxide networks is successfully obtained by electrochemical oxidation on highly basic media at room temperature (7,8). In this case the intercalation reaction is of particular interest because of the oxidized phase that is a bulk superconductor with an onset transition temperature of 45 K.…”

Section: Introductionmentioning

confidence: 97%

“…Chronoamperometric experiments (15) and synchrotron X-ray powder diffraction studies (16) (8,14,19,20). From the electrochemical point of view, the oxygen evolution on perovskites has been the object of extensive study (12,13,(21)(22)(23) but there is a lack of experimental works which attempt to electrochemically characterize the La CuO phase in alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Investigation of Oxygen Intercalation into La2CuO4+δPhases

Magnone

Cerisola

Ferretti

et al. 1999

Journal of Solid State Chemistry

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Electrochemical Investigation of Oxygen Intercalation into La2CuO4+δPhases

Magnone

Cerisola

Ferretti

et al. 1999

Journal of Solid State Chemistry

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“…Grenier and coworkers [156] found a large discrepancy between TGA and iodometric results, which they could correlate with excess O adsorbed on nonbonding sites from the electrolytic solution. Correcting for the adsorbed fraction, they found that the two measurements would be reconciled if each O contributes two holes to the CuO 2 plane, or P = 2δ.…”

Section: B Estimating Hole Densitymentioning

confidence: 99%

“…Figure 61 is a composite phase diagram based on the work of several groups [682,156]. As discussed in Section VI.B, there is some uncertainty about relating the O content δ to the hole doping, P , with different groups finding relations from δ = 2P [156] to δ = P [157].…”

Section: O-doping Of La2cuo 4+δmentioning

confidence: 99%

“…In electrochemically doped La 2 CuO 4+δ , there is a range of δ over which two superconducting phases coexist, with T c 's of 32K and ≈ 40 − 45K [688,156,159,685,689]. Grenier, et al [684] suggested that these two phases correspond to δ = 1/16 and 1/8, respectively, while Johnston [160] finds the two-T c coexistence between 0.06 ≤ δ ≤ 0.11, with a single T c ≃43-45K for 0.11 ≤ δ ≤ 0.12.…”

Section: O-doping Of La2cuo 4+δmentioning

confidence: 99%

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A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

371

280

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The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the high-Tc cuprates near the composition of optimum Tc. This paper offers a comprehensive survey of the VHS model, describing both theoretical properties and experimental evidence for the picture. Special topics discussed include a survey of the Fermi surfaces of the cuprates and related compounds, and an analysis of the reliability of the slave boson approach to correlation effects. While many properties of the cuprates can be qualitatively understood by a simple rigid-band-filling model, this is inadequate for more quantitative results, since correlation effects tend to pin the Fermi level near the VHS over an extended doping range, and can lead to a nanoscale phase separation. Furthermore, the peaks in the dos lead to competition from other instabilities, both magnetic and structural (related to charge density waves). A novel form of dynamic structural instability, involving dynamic VHS-Jahn-Teller effects has been predicted. Scattered through the literature, there is considerable experimental evidence for both nanoscale phase separation of holes, and for local, possibly dynamic, structural disorder. This review attempts to gather these results into a comprehensive database, to sort the results, and to see how they fit into the Van Hove scenario. Recent experiments on underdoped cuprates are found to provide a strong confirmation that the pseudogap is driven by a splitting of the VHS degeneracy.

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Metal-Organic Chemical Vapor Deposition of La2CuO4+x Thin Films with Gas Phase Composition Control

DeSisto¹,

Cukauskas²,

Rappoli³

et al. 1999

Chem. Vap. Deposition

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Composition-controlled metal-organic chemical vapor deposition of La 2 CuO 4 thin films using ultraviolet absorption sensors to provide incoming precursor flux control is reported. These sensors provide a more flexible and sensitive alternative to ultrasonic sensors. The films were c-axis oriented and semiconducting as grown on LaAlO 3 substrates. Chemical oxidization at room temperature in a sodium hypobromite solution resulted in an expansion of the c-axis lattice parameter and the conversion of the semiconducting film into a superconductor with a zero-resistance transition temperature of 32 K.

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A new superconductor obtained by electrochemical oxidation of La2CuO4

Cited by 150 publications

References 20 publications

Electrochemical Investigation of Oxygen Intercalation into La2CuO4+δPhases

Electrochemical Investigation of Oxygen Intercalation into La2CuO4+δPhases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Metal-Organic Chemical Vapor Deposition of La2CuO4+x Thin Films with Gas Phase Composition Control

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