Properties of YBa2Cu3O7−δ thin films grown on vicinal SrTiO3 (001) substrates

Méchin, Laurence; Berghuis, P.; Evetts, J.E.

doi:10.1016/s0921-4534(98)00209-3

Cited by 51 publications

(41 citation statements)

References 23 publications

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“…For large θ>θ 1 a lattice of rectilinear but elliptically cored Abrikosov vortices is expected, below θ 1 the flux lines become distorted, whilst for small θ<θ 2 a fully kinked lattice of flux lines consisting of vortex pancake and Josephson string elements is predicted 15 . The values of θ 1 is given by tan(θ 1 )=d/ξ ab (t) (1) and that of θ 2 by tan(θ 2 )=ε (2) where t is the reduced temperature T/T c and ε is the Ginzburg-Landau anisotropy parameter. At t=0, θ 1 =35º and θ 2 =11º.…”

Section: Critical Current Measurements and Vortex Channelingmentioning

confidence: 99%

“…1,2 One example of such an effect is the vortex channeling effect observed in vicinal YBa 2 Cu 3 O 7-δ films when a magnetic field is applied parallel to the a-b plane direction. 3,4 These films exhibit a critical current density (j c ) parallel to the vicinal steps similar to that found in c-axis films and a suppressed j c for currents flowing perpendicular to the steps where c-axis directed current transport must occur.…”

Section: Introductionmentioning

confidence: 99%

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Flux line lattice structure and behavior in antiphase boundary free vicinal YBa2Cu3O7−δ thin films

Durrell

Mennema

Jooß³

et al. 2003

Journal of Applied Physics

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Section: Critical Current Measurements and Vortex Channelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flux line lattice structure and behavior in antiphase boundary free vicinal YBa2Cu3O7−δ thin films

Durrell

Mennema

Jooß³

et al. 2003

Journal of Applied Physics

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“…[5][6][7] For electronics applications, smoother surfaces are desired, which can be obtained by step-flow growth, which occurs at higher growth temperatures or on substrates cut with a small vicinal angle. [8][9][10] However, step-flow growth largely suppresses the formation of extended dislocations, 8,11 making J c values lower. 12 At lower growth temperatures, however, vicinal substrates can provide many additional defects that, for example, can produce high densities of antiphase boundaries and stacking faults that make strongpinning centers in YBCO films.…”

Section: Introductionmentioning

confidence: 99%

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

Chen

Kametani

Kim

et al. 2008

Journal of Applied Physics

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Epitaxial high-temperature superconducting YBa 2 Cu 3 O 7−x thin films grown on 2°miscut ͑001͒ ͑LaAlO 3 ͒ 0.3 -͑SrAl 0.5 Ta 0.5 O 3 ͒ 0.7 substrates by pulsed laser deposition show significant and systematic changes in flux pinning properties on changing the substrate temperature from 730 to 820°C. The bulk pinning force is highest for the 760°C growth, rising to a maximum of 4.4 GN/ m 3 at 77 K, though there are indications that vortex pinning strength is even higher for the 730°C growth once allowance for the current-blocking effects of a-axis oriented grains is made. Cross-sectional transmission electron microscope images show that the density of antiphase boundaries, stacking faults, and edge dislocations increases strongly with decreasing growth temperature, and is highest at 730°C. In spite of the enhanced density of the pinning defects mentioned above, their vortex pinning effect is still much smaller than for insulating nanoparticles of high density and optimum size, where pinning forces can be four to five times higher.

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“…7,8 The film terraces are smooth and inclined by an angle ϭ9.5°Ϯ1.7°with respect to the macroscopic film surface in good agreement to the nominal substrate miscut angle. Due to the bunching of small steps with unit-cell height 9 10 The films reveal a metallic conductivity behavior in the normal state (100 KрTр290 K). Only for the thinnest films (h р30 nm) the resistivities O and c show a slight increase for temperatures close to the superconducting phase transition.…”

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confidence: 99%

Electrical properties, texture, and microstructure of vicinal YBa2Cu3O7−δ thin films

Pedarnig

Rössler

Delamare

et al. 2002

Applied Physics Letters

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Vicinal YBa 2 Cu 3 O 7Ϫ␦ ͑YBCO͒ thin films of thickness hϭ20-480 nm are grown by pulsed-laser deposition on 10°miscut ͑001͒ SrTiO 3 substrates. The anisotropic resistivities, c-axis texture, and critical temperature drastically depend on the thickness of vicinal films. High-resolution electron microscopy reveals a defect microstructure with strong bending of the YBCO lattice near the SrTiO 3 interface and improved film microstructure at larger distances to the substrate. The required layer thickness for microstructure relaxation and increase of electrical conductivity are significantly larger than the critical thickness of c-axis oriented YBCO films. © 2002 American Institute of Physics. ͓DOI: 10.1063/1.1508418͔ High-temperature superconductors ͑HTS͒ have a quasi two-dimensional structure and reveal strongly anisotropic physical properties. For HTS thin films on single crystal substrates the c-axis orientation is energetically favored and only the ab-plane transport properties can be measured. However, on miscut substrates a coherently tilted, vicinal structure of the films can develop and the transport properties within the ab plane and along the c axis can be derived on the very same sample. Vicinal films are especially important for the characterization of materials which are not available as phase pure single crystals 1 and for the investigation of phenomena occurring in thin layers of a material. 2,3 Vicinal Bi 2 Sr 2 CaCu 2 O 8ϩ␦ ͑Bi-2212͒ thin films show anisotropic resistivities independent of film thickness h in the range h ϭ20-300 nm. 4 These results are in striking contrast to the resistivity behavior of vicinal YBa 2 Cu 3 O 7Ϫ␦ films.In this letter we report on vicinal YBa 2 Cu 3 O 7Ϫ␦ ͑YBCO͒ thin films (hϭ20-480 nm) which reveal an extremely strong increase of resistivities and a reduced c-axis texture for thicknesses less than 100 nm. YBCO films are grown by pulsed-laser deposition ͑PLD͒ on miscut ͑001͒ SrTiO 3 substrates. UV-excimer laser pulses ( ϭ248 nm, L Ϸ20 ns, repetition rate 10 Hz, fluence 3.25 J/cm 2 ) are employed for target ablation. 6 The vicinal angle is s ϭ10°and the substrates polished after cutting have a rms surface roughness of less than 0.2 nm ͑TBL Kelpin͒.The thickness of vicinal YBCO films linearly increases with the number of laser pulses employed for target ablation. The deposition rate is 0.34Ϯ0.01 Å/pulse. The vicinal films have a step-like surface morphology due to step-flow growth as observed by atomic force microscopy. 7,8 The film terraces are smooth and inclined by an angle ϭ9.5°Ϯ1.7°with respect to the macroscopic film surface in good agreement to the nominal substrate miscut angle. Due to the bunching of small steps with unit-cell height 9 relatively large terraces of width 107Ϯ27 nm and steps of height 18Ϯ6 nm are formed for films of 75 nm thickness. The anisotropic resistivities of vicinal YBCO films P (T) and O (T) were obtained from far-point measurements on current tracks oriented parallel and orthogonal to the vicinal steps, respectively. The in-plane ab (T) a...

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Properties of YBa2Cu3O7−δ thin films grown on vicinal SrTiO3 (001) substrates

Cited by 51 publications

References 23 publications

Flux line lattice structure and behavior in antiphase boundary free vicinal YBa2Cu3O7−δ thin films

Flux line lattice structure and behavior in antiphase boundary free vicinal YBa2Cu3O7−δ thin films

Influence of growth temperature on the vortex pinning properties of pulsed laser deposited YBa2Cu3O7−x thin films

Electrical properties, texture, and microstructure of vicinal YBa2Cu3O7−δ thin films

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