Anisotropic transport properties of in-plane-aligned<i>a</i>-axis<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></

Suzuki, Yuri; D, Lew; Marshall, A. E.; Mr, Beasley; Th, Geballe

doi:10.1103/physrevb.48.10642

Cited by 56 publications

(15 citation statements)

References 17 publications

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“…Due to the presence of antiphase and other grain boundaries, these values are less than the resistivity anisotropy ratio ͑ϳ30͒ of single-crystal YBCO. 6 The b-and c-axis in-plane orientation for a-axis YBCO/PBCO films on ͑100͒ LSGO not only allows for possible novel device geometries such as a-axis vertical junctions with YBCO wiring in the b direction, but also anisotropic film characterizations. 8 Since the a͒ Also Department of Electrical Engineering, University of Maryland, College Park, MD 20742. characteristics of these films on LSGO compare favorably with the best-reported values, 5,6 we used this substrate to study the feasibility of controlling the roughness and grain size of the films by varying the O 2 pressure during deposition.…”

Section: Center For Superconductivity Research Department Of Physicsmentioning

confidence: 99%

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Trajanovic

Takeuchi

Warburton

et al. 1995

Applied Physics Letters

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The granularity and surface roughness of a-axis YBa2Cu3O7−x films grown on (100) LaAlO3, (100) SrTiO3, and (100) LaSrGaO4 by pulsed laser deposition has been studied. For fixed deposition conditions, the size and the shape of the grains varied from substrate to substrate, while the mean roughness remained the same. We were able to systematically control the grain size and smoothness of films on LaSrGaO4 and LaAlO3. By gradually reducing the oxygen pressure during the deposition we obtained films with increased grain size and much reduced surface roughness (mean ∼40 Å over 5 ×5 μm2). Cracks observed in the films deposited on LaSrGaO4 at very low O2 pressures (∼20 mTorr) were successfully eliminated for deposition pressures above 40 mTorr.

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Section: Center For Superconductivity Research Department Of Physicsmentioning

confidence: 99%

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Trajanovic

Takeuchi

Warburton

et al. 1995

Applied Physics Letters

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“…b-and c-axis of the grown YBCO films preferentially align along the [010] and [001] directions on the LSGO(100) substrate [7][8][9][10]. Therefore a-axis oriented YBCO films on LSGO(100) have a resistivity anisotropy ratio of about 10 at room temperature.…”

Section: Nbco Films By Pulsed Laser Depositionmentioning

confidence: 99%

“…Ishimaru et al [5] fabricated Joshepson junctions reproducibly, using c-axis oriented NBCO thin films with smooth surface morphology by focused ion beam technique. Thin films [7][8][9][10][11][12] with a-or b-axis perpendicular to the substrates are (105) also desirable for the fabrication of superconducting devices based on the Josephson junction in view of the highly anisotropic coherence length of high temperature superconductors. Although growth of NBCO thin films with a-axis orientation on SrTiO3 (STO)(100) substrates was reported uniquely by Badaye et al [13], the superconducting transition temperature was not satisfactory compared with that of a-axis oriented YBCO thin films.…”

Section: Introductionmentioning

confidence: 99%

Growth of NdBa₂Cu₃O_7-δSuperconducting Thin Films on SrTiO₃(100) and LaSrGaO₄(100) Substrates

Park

Kim

et al. 1997

Acta Phys. Pol. A

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NdBa2Cu3O7-δ superconducting thin films were grown on SrΤiO 3 (100) and LaSrGaO 4 (100) substrates by off-axis rf sputtering and pulsed laser deposition. The effects of several deposition parameters, e.g. gas pressure, substrate temperature and energy density were studied. Thin films grown by off-axis rf sputtering were highly c-axis oriented, but those by pulsed laser deposition were predominantly a-axis oriented under our deposition conditions. However, the c-axis oriented portion for the films grown by pulsed 1aser deposition was increased by increasing the temperature above 800°C.T c ( z e r o )w a s 8 7 K a n d 8 3 K f o r t h ec -a n d a -a x i s o r i e n t e d f i l m s r e s p e c t i v e l y . The critical current density of c-axis oriented films was 10 6 -10 7 A/cm2 below 60 K.

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“…These films are traditionally grown с-oriented due to the relative simplicity of their growth technique [4]. However, recently much attention has been paid to а-oriented YBa 2 Cu 3 O 7 − x films [5][6][7][8][9][10][11], which have a higher application potential for quantum devices (including sandwich-type Josephson junctions) than c-oriented films, because the coherence length in the directions perpendicular to the с axis (1.5−2.0 nm) is much larger than along the c axis (0.2−0.3 nm) [13,14]. The reduction and disappearance of c-oriented domains, depending, e.g., on the growth conditions, were thoroughly investigated [5,14].…”

Section: Introductionmentioning

confidence: 99%

Growth of twin-free b-oriented YBa2Cu3O7 − x films

2015

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YBa 2 Cu 3 O 7 − x films of b orientation have been grown on the surface of (100)SrLaGaO 4 crystal. It is demonstrated that the films pass to the superconducting state at a temperature of 89 K. In the nonsuperconducting region, the film resistance decreases linearly with a decrease in temperature at a rate of 30 Ω per 100°С. According to the X-ray diffraction data on the crystallographic structure of the YBa 2 Cu 3 O 7 − x films, they are single-crystal and b-oriented. It is shown that the films contain no domains of other crystallographic orientations, including a-oriented domains. Therefore, the films are free of structural twins.

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Anisotropic transport properties of in-plane-aligneda-axisYBa2Cu3

Cited by 56 publications

References 17 publications

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Growth of NdBa₂Cu₃O_7-δSuperconducting Thin Films on SrTiO₃(100) and LaSrGaO₄(100) Substrates

Growth of twin-free b-oriented YBa2Cu3O7 − x films

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Anisotropic transport properties of in-plane-aligneda-axisYBa2Cu3

Cited by 56 publications

References 17 publications

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Oxygen pressure dependence of the grain size and surface morphology in YBa2Cu3O7−x a-axis films

Growth of NdBa2Cu3O7-δSuperconducting Thin Films on SrTiO3(100) and LaSrGaO4(100) Substrates

Growth of twin-free b-oriented YBa2Cu3O7 − x films

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Growth of NdBa₂Cu₃O_7-δSuperconducting Thin Films on SrTiO₃(100) and LaSrGaO₄(100) Substrates