Transport and magnetic properties of the superconducting La2CuO4+δ phases (0 &lt; δ &lt; 0.09) prepared by electrochemical oxidation

Grenier, J.‐C.; Lagueyte, N.; Wattiaux, Alain; Doumerc, Jean‐Pierre; Dordor, P.; Étourneau, J.; Pouchard, Michel; Goodenough, John B; Zhou, Jianshi

doi:10.1016/0921-4534(92)90163-7

Cited by 136 publications

(43 citation statements)

References 23 publications

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“…6. This behavior is similar to the evolution of the ( c-axis and in-plane) 1attice parameters of the "interstitially" oxygen-doped `214' compound [48,49], also indicated in Fig. 6.…”

Section: Structural Properties: Oxygen Incorporationsupporting

confidence: 63%

“…The critical thickness (hc) and the density of misfit dislocations as a function of thickness will be determined by this expanded in-plane lattice pa-rameter (which is clearly even further expanded thermally). The reported change upon oxidizing the reduced Sr-doped compound [47] is of the order of 0.003 to 0.005 Å , which is about the half of that reported for oxygen-doped '21.1' bulk samples [48,49]. In the last case, the decrease in the in-plane lattice parameter for an interstitial oxygen content increasing between 0.0 and 0.06 -which is "charge equivalent" to the amount of oxygen uptake for a film with a strontium content between 0.0 and 0.12 -is about 0.013Å on 3.80Å (averaged over the αn and b-axes).…”

Section: Structural Properties: Oxygen Incorporationmentioning

confidence: 50%

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Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties

Locquet

Williams

1997

Acta Phys. Pol. A

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In this paper, the critical role played by various types of defects and strain relaxation mechanisms in high-Tc thin films is highlighted and mustrated with examples. The defects are essential for providing adequate diffusion channels for oxygen ingress during the cooling step in c-axis thin films. The operation of strain relaxation mechanisms necessitated by the 1attice mismatch between film and substrate can impose a compressive or tensile biaxial pressure, which either increases or reduces the critical temperature.

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“…6. This behavior is similar to the evolution of the ( c-axis and in-plane) 1attice parameters of the "interstitially" oxygen-doped `214' compound [48,49], also indicated in Fig. 6.…”

Section: Structural Properties: Oxygen Incorporationsupporting

confidence: 63%

Section: Structural Properties: Oxygen Incorporationmentioning

confidence: 50%

Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties

Locquet

Williams

1997

Acta Phys. Pol. A

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“…Earlier it was believed that the underline mechanism of electronic phase separation was associated with defects, oxygen or cation disorder. Indeed, oxygen phase segregation was observed on the La 2 CuO 4+δ by x-ray and transport measurements [5,15]. However depending on the type of experiment, there are some HTSC materials, specially YBCO, that appear to be more homogeneous or, at least do not display any gross inhomogeneity [38,39].…”

Section: Electronic Phase Separationmentioning

confidence: 99%

“…The local density of states (LDOS) measured in these STM experiments [11][12][13] has two different forms that are possibly associated with a segregation into metallic and insulator nanoscopic regions [14]. Consequently the electronic phase separation in cuprates has been the subject of many articles [15][16][17][18][19][20][21][22] and many books [23][24][25]. The electronic disorder of the normal phase are manifested in many transport properties of a HTSC series, like the resistivity as function of the temperature R(T ), that despite its importance, lacks a widely accepted explanation.…”

Section: Introductionmentioning

confidence: 99%

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

Pinheiro¹,

Mello²

2012

Physica A: Statistical Mechanics and its Applications

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The resistivity as function of temperature of high temperature superconductors is very unusual and despite its importance lacks an unified theoretical explanation. It is linear with the temperature for overdoped compounds but it falls more quickly as the doping level decreases. The resistivity of underdoped cuprates increases as an insulator below a characteristic temperature where it shows a minimum. We show that this overall behavior can be explained by calculations using an electronic phase segregation into two main component phases with low and high electronic densities. The total resistence is calculated by the various contributions through several random picking processes of the local resistivities and using a common statistical Random Resistor Network approach.

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“…These samples are found to be approximately single phase, but with largeperiod superlattices [157,684,685]. For a given δ, there can be several different superlattices [686].…”

Section: O-doping Of La2cuo 4+δmentioning

confidence: 99%

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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Transport and magnetic properties of the superconducting La2CuO4+δ phases (0 < δ < 0.09) prepared by electrochemical oxidation

Cited by 136 publications

References 23 publications

Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties

Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

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

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Transport and magnetic properties of the superconducting La2CuO4+δ phases (0 < δ < 0.09) prepared by electrochemical oxidation

Cited by 136 publications

References 23 publications

Epitaxially Induced Defects in Sr- and O-doped La2CuO4Thin Films Grown by MBE: Implications for Transport Properties

Epitaxially Induced Defects in Sr- and O-doped La2CuO4Thin Films Grown by MBE: Implications for Transport Properties

Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition

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

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Product

Resources

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Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties

Epitaxially Induced Defects in Sr- and O-doped La₂CuO₄Thin Films Grown by MBE: Implications for Transport Properties