Microscopic Studies on Y2Ba4Cu7O15−by Use of TEM and NQR Techniques

Kato, Masaki; Nakanishi, Makoto; Miyano, T.; Shimizu, Tadashi; Kakihana, Masato; Yoshimura, Kazuyoshi; Koyamada, Koji

doi:10.1006/jssc.1998.7840

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…We can plausibly attribute this T c reduction to the nanoscale YBCO-247 regions seen in our high-resolution STEM images, sinceYBCO-247 has generally shown lower T c than either YBCO-124 or fully-oxygenated YBCO-123. 36,37 We note that an alternative explanation of this T c reduction in terms of under-oxygenated YBCO-123 is not likely, since the LCMO overlayer was grown in-situ at an even higher oxygen pressure than the YBCO layer. 13 To explain the formation of CuO intergrowths in our LCMO/YBCO films, we consider the lattice structures of the materials involved in the heteroepitaxy.…”

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confidence: 92%

Attenuation of superconductivity in manganite/cuprate heterostructures by epitaxially-induced CuO intergrowths

Zhang

Gauquelin

Botton

et al. 2013

Applied Physics Letters

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We examine the effect of CuO intergrowths on the superconductivity in epitaxial La 2/3 Ca 1/3 MnO 3 / YBa 2 Cu 3 O 7−δ (LCMO/YBCO) thin-film heterostructures. Scanning transmission electron microscopy on bilayer LCMO/YBCO thin films revealed double CuO-chain intergrowths which form regions with the 247 lattice structure in the YBCO layer. These nanoscale 247 regions do not appear in x-ray diffraction, but can physically account for the reduced critical temperature (T c ) of bilayer thin films relative to unilayer films with the same YBCO thickness, at least down to ∼ 25 nm. We attribute the CuO intergrowths to the bilayer heteroepitaxial mismatch and the T c reduction to the generally lower T c seen in bulk 247 samples. These epitaxially-induced CuO intergrowths provide a microstructural mechanism for the attenuation of superconductivity in LCMO/YBCO heterostructures.

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confidence: 92%

Attenuation of superconductivity in manganite/cuprate heterostructures by epitaxially-induced CuO intergrowths

Zhang

Gauquelin

Botton

et al. 2013

Applied Physics Letters

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“…Many studies have been done to increase superconducting transition temperature, T c , and critical current density, J c . In general, three different phases of YBCO exist: Y-123 with 90 K, Y-124 with 84 K and Y-247 with 65 K, respectively [2][3][4][5]. The YBCO system is capable of high current carrying capacity at liquid nitrogen temperature and has simple fabrication compared to the other HT c superconductors such as Bi-or Tl-based system [6,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermoelectric power with modification of two band model with linear T term for superconductors and thermal conductivity study of Se added YBCO samples

Altın

Aksan

Yakıncı

2014

Journal of Alloys and Compounds

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“…More interestingly, our data seem to suggest that the film containing YBCO-247 is more underdoped than the films without YBCO-247 because the shoulder at 932 eV is the weakest in Sample A. This observation could explain the generally lower T c reported in pure YBCO-247 samples [30,31]. On the other hand, in the E c data, the peak near 931 eV is mostly associated with the Cu(1) atoms in the CuO chains [32].…”

Section: Resultsmentioning

confidence: 50%

Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films

Zhang

Gauquelin

McMahon

et al. 2018

Phys. Rev. Materials

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It is known that solid-state reaction in high-pressure oxygen can stabilize high-oxidation phases of Y-Ba-Cu-O superconductors in powder form. We extend this superoxygenation concept of synthesis to thin films which, due to their large surface-to-volume ratio, are more reactive thermodynamically. Epitaxial thin films of YBa2Cu3O 7−δ grown by pulsed laser deposition are annealed at up to 700 atm O2 and 900 • C, in conjunction with Cu enrichment by solid-state diffusion. The films show clear formation of Y2Ba4Cu7O 15−δ and Y2Ba4Cu8O16 as well as regions of YBa2Cu5O 9−δ and YBa2Cu6O 10−δ phases, according to scanning transmission electron microscopy, x-ray diffraction and x-ray absorption spectroscopy. Similarly annealed YBa2Cu3O 7−δ powders show no phase conversion. Our results demonstrate a novel route of synthesis towards discovering more complex phases of cuprates and other superconducting oxides.

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Microscopic Studies on Y2Ba4Cu7O15−by Use of TEM and NQR Techniques

Cited by 11 publications

References 28 publications

Attenuation of superconductivity in manganite/cuprate heterostructures by epitaxially-induced CuO intergrowths

Attenuation of superconductivity in manganite/cuprate heterostructures by epitaxially-induced CuO intergrowths

Investigation of thermoelectric power with modification of two band model with linear T term for superconductors and thermal conductivity study of Se added YBCO samples

Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films

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