Microstructure of epitaxial YBa2Cu3O7 films on step-edge SrTiO3 substrates

Jia, Chun‐Lin; Kabius, B.; Urban, K.; Herrman, K.; Cui, G.J.; Schubert, J.; Zander, W.; Braginski, A. I.; Heiden, C.

doi:10.1016/0921-4534(91)90263-x

Cited by 161 publications

(43 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is expected because the (110) facet (in fact ( 101 ) or (011 ) ) has an angle of inclination with respect to the (001) plane equal to 45 °. TEM investigations on such rather steep surface inclinations showed that the YBCO film tend to nucleate a-axis grain on these [9 ].…”

Section: Substratementioning

confidence: 99%

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

Træholt

Wen

Zandbergen

et al. 1994

Physica C: Superconductivity

View full text Add to dashboard Cite

YBa2Cu307 films in c-axis orientation on bicrystalline SrTiO3 substrates are investigated by TEM. The films and the substrates are examined in cross-section and in plane view. The grain boundary of the bicrystal substrate contains (110) faceted voids, but is otherwise straight on a nanometer scale. Contrary to this, the film grain boundary is not straight. The deviation from a straight grain boundary can be up to 100 nm for a 100 nm thick film. The deviation from the intended position of the YBCO grain boundary can already occur at the film/substrate interface where it can be as much as + 50 nm.

show abstract

Section: Substratementioning

confidence: 99%

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

Træholt

Wen

Zandbergen

et al. 1994

Physica C: Superconductivity

View full text Add to dashboard Cite

show abstract

“…Film growth with a tilt angle a between the film c-axis and the surface normal as expected from lattice matching has been confirmed by X-ray diffraction measurements. Epitaxial film grown with unaltered c-axis orientation across low-angle steps on (100) SrTi03 substrates has been reported recently [8] indicating parallel alignment of YBa2Cu307_(f and SrTi03 (100) planes independent of a.…”

Section: S =mentioning

confidence: 99%

Thermoelectric Effect in Normal-State YBa ₂ Cu ₃ O _7-δ Films

et al. 1994

View full text Add to dashboard Cite

Abstract. -Signal pulses of several 100 volts and currents of several amperes have been obtained at lateral surface contacts on normal-state YBa2Cu307_^ films in response to pulsed laser irradiation. The signals are shown to be of thermoelectric origin. Thermoelectric fields transverse to the laser-induced temperature gradient are due to the anisotropy of the thermopower in YB2^Cuz01_i giving rise to non-zero off-diagonal elements a a of the Seebeck tensor for films prepared with a tilt angle a between the film c-axis and the film surface normal. Large-tilt-angle films (up to a = 20°) could be grown on specially cut substrates and may be useful as almost wavelength-independent room temperature radiation detectors. In this letter experiments are reported which proof that the voltaic signals are purely of thermoelectric origin. A comparison of signals induced by laser irradiation, or, alternatively, by a thermal heat source, shows that the signal strength is solely related to the flow of thermal energy through the film. Furthermore, it is shown that the voltaic signals are proportional to the tilt angle a between the crystallographic film c-axis and the film surface normal, in accordance with the tensorial Seebeck effect.The thermoelectric field due to the Seebeck effect is given by where S is the Seebeck tensor and VT the temperature gradient. With respect to the coordinate system defined in fig. 1, the Seebeck tensor for YBa2Cu307_4> depending on the tilt angle a, and taking into account the values of main anisotropy of the thermopower Sc along the crystallographic c-axis and Sab in the (a, 6)-plane [7], is of the form

show abstract

“…As in most HTS multilayer circuits, our test samples include crossovers and via connections that require low-angle edges to prevent unwanted grain boundary formation. 12 We have developed a technique for forming such shallow edges using a proximity exposure process suitable for our relatively thick multilayer films. A 2-m-thick positive photoresist layer is exposed in a contact mask aligner using a multistep procedure.…”

Section: ͓S0003-6951͑97͒00534-2͔mentioning

confidence: 99%

High temperature superconducting Josephson junctions in a stacked bicrystal geometry

Ono

Vale

et al. 1997

Applied Physics Letters

View full text Add to dashboard Cite

Bicrystal grain boundary Josephson junctions were fabricated in a stack of two layers of YBa2Cu3Ox separated by epitaxial SrTiO3. Weak link behavior was observed in the bridges formed in both layers that had similar shunted-junction characteristics but significantly different critical currents. Characteristic voltages up to 1.9 mV were measured at 4.5 K. The resonant structure was seen in the current–voltage characteristics of the upper-layer junctions, and interactions between junctions in the two layers were evident.

show abstract

Microstructure of epitaxial YBa2Cu3O7 films on step-edge SrTiO3 substrates

Cited by 161 publications

References 8 publications

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

Thermoelectric Effect in Normal-State YBa ₂ Cu ₃ O _7-δ Films

High temperature superconducting Josephson junctions in a stacked bicrystal geometry

Contact Info

Product

Resources

About

Microstructure of epitaxial YBa2Cu3O7 films on step-edge SrTiO3 substrates

Cited by 161 publications

References 8 publications

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

TEM investigation of YBa2Cu3O7 thin films on SrTiO3 bicrystals

Thermoelectric Effect in Normal-State YBa 2 Cu 3 O 7-δ Films

High temperature superconducting Josephson junctions in a stacked bicrystal geometry

Contact Info

Product

Resources

About

Thermoelectric Effect in Normal-State YBa ₂ Cu ₃ O _7-δ Films