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Worthington, T. K.; Gallagher, W. J.; Dinger, T. R.

doi:10.1103/physrevlett.59.1160

Cited by 565 publications

(51 citation statements)

References 13 publications

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“…This anisotropy ratio maintains approximately to the highest field at which point the critical current density has decreased by a factor of ~ 5. Although the anisotropy is not as large as found in YBa2Cu307 crystals [63], the magnitude of the critical current density is comparable to that determined [64] by magnetization measurements on annealed single crystals of YBa2Cu307. The relatively low critical current density calculated assuming bulk superconductivity, however, appears to be inconsistent with a small Meissner fraction arising from strong flux pinning.…”

Section: Superconductivitymentioning

confidence: 51%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

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We review the crystal chemical, electronic, magnetic and superconducting properties of La2CuO4 and related planar-cuprate materials, with emphasis on single-crystal results. Although magnetism due to divalent copper ions clearly is evident in nonsuperconducting crystals, experiments do not reveal any direct relationship between localized copper spins and high temperature superconductivity. We also indicate areas where important information is lacking for our understanding of these materials.

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Section: Superconductivitymentioning

confidence: 51%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

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“…In the case of our nanostructures one can easily show that the J C (γ ) follows the relation [34,35] Fig. 4(a)].…”

Section: Nanostructures To Study In-plane London Anisotropymentioning

confidence: 99%

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

et al. 2017

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In the present work, we report the growth of fully untwinned high-quality a-axis-oriented YBa 2 Cu 3 O 7−δ films on (100) SrLaGaO 4 substrates by using PrBa 2 Cu 3 O 7−δ as a buffer layer. We also fabricated nanowires at different angles γ with respect to the [0,1,0] direction of the substrate and studied the in-plane anisotropy of the critical current density, which we explained by considering the anisotropy in the coherence length ξ and London penetration depth λ L . Finally, half-integer Shapiro-like steps measured in slightly underdoped c-axis oriented (γ = 90• ) nanowires point towards a different transport regime, which could shed light on intriguing issues of high-critical-temperature superconductors.

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“…ξ = 37 nm for lead. Since T c is 92 K in YBCO we can expect a small coherence length, however, due to the low density of carriers in cuprates, the Fermi velocity is also very small which makes coherence length even smaller such that ξ ab = 1.5 nm and ξ c = 0.2 nm [24]. YBCO is characterized by an electronic mass anisotropy, γ, causing ξ c shorter than that of the basal plane by ξ c = ξ ab /γ.…”

Section: Superconducting Propertiesmentioning

confidence: 99%

Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices—the first 30 years (Review Article)

Habermeier

2016

Low Temperature Physics

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Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices -the first 30 years (Review Article) H.-U. Habermeier Science Consulting International, Niersteinerstr, 28, Stuttgart D 70499, Germany Max-Planck-Institute for Solid State Research, Heisenbergstr, 1, Stuttgart D 70569, Germany E-mail: huh@fkf.mpg.de Received May 30, 2016, published online August 25, 2016 During the three decades after the discovery of superconductivity at high temperatures in copper oxides, intense research activities generated a tremendous progress in both, mastering the scientific challenges underpinning the understanding of the properties of these chemically and structurally complex materials as well as achieving a mature technology in preparing single phase bulk specimens -including single crystals -and epitaxially grown single crystalline thin films. This review covers in addition to more basic physics oriented developments mainly technological aspects of complex oxide thin film deposition as an enabling technology to explore the physics of these materials. It consists of two parts: after a brief introduction to the materials development prior to the discovery of superconducting copper oxides, a description of the relevant properties of copper oxide superconductors with focus on YBa 2 Cu 3 O 7-δ is given, followed by the coverage of essentials of complex oxide thin film deposition technology with the copper oxides at its core. Here, the major physical vapor deposition technologies (evaporation and oxide molecular beam technology, sputtering and pulsed laser deposition) are described followed by an overview of substrate requirements to deposit high quality thin films. Opportunities by choosing special substrates with unique properties far beyond the usual mechanical support for a film are introduced with examples aside from usual lattice mismatch induced strain effects. One is the continuous modification of the strain state by poling ferroelectric oxide substrates linked to a piezoelectric effect, the other is the nanoscale tailoring of substrate step-and-terrace structures resulting in a controllable generation of planar defects in complex oxides, thus contributing to the physics of flux-line pinning in cuprate superconductors. In the second part of this review, first some highlights of single layer thin film research are given such as to tailor thin film orientation, generating well defined antiphase boundaries in YBa 2 Cu 3 O 7-δ thin films as flux-line pinning centers as well as contributions to understand fluctuation conductivity in relation to the pseudogap state. In the last section new developments in high T c cuprate based heterostructures and superlattices are reviewed with a special focus on the opportunities offered by interface-induced electronic interactions.

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Anisotropic nature of high-temperature superconductivity in single-crystalY1Ba2

Cited by 565 publications

References 13 publications

Properties of La2CuO4 and related compounds

Properties of La2CuO4 and related compounds

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices—the first 30 years (Review Article)

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