“…The structural properties of the films, as measured by XRD, are similar to those measured before [7,12]. As the BCO content increases, the full width at half maximum (FWHM) of the YBCO (0 0 5) reflection increases, indicating an increase in microstrain along [0 0 l ].…”
Section: Resultssupporting
confidence: 54%
“…Details of the film deposition on SrTiO 3 (1 0 0) substrates and the target preparation can be found in [1,12]. The BCO-0 sample was also used in [1].…”
We measured the resistivity of pulsed-laser-deposited BaCeO3 (BCO)-doped YBCO thin films containing spherical BCO particles in fields up to 30 T. The average diameter of the particles depends on the dopant concentration being below 4 nm in all the samples. Raised values of the upper critical field, Bc2, were observed in all the samples. Additionally, the parameter γ, describing the electron mass anisotropy, decreased from 6.2 in the undoped sample to 3.1 in the 8 wt.% BCO-doped sample. These results can be explained by the increased number of defects decreasing the mean free path of electrons and thus lowering the coherence length, which in turn increases Bc2.
“…The structural properties of the films, as measured by XRD, are similar to those measured before [7,12]. As the BCO content increases, the full width at half maximum (FWHM) of the YBCO (0 0 5) reflection increases, indicating an increase in microstrain along [0 0 l ].…”
Section: Resultssupporting
confidence: 54%
“…Details of the film deposition on SrTiO 3 (1 0 0) substrates and the target preparation can be found in [1,12]. The BCO-0 sample was also used in [1].…”
We measured the resistivity of pulsed-laser-deposited BaCeO3 (BCO)-doped YBCO thin films containing spherical BCO particles in fields up to 30 T. The average diameter of the particles depends on the dopant concentration being below 4 nm in all the samples. Raised values of the upper critical field, Bc2, were observed in all the samples. Additionally, the parameter γ, describing the electron mass anisotropy, decreased from 6.2 in the undoped sample to 3.1 in the 8 wt.% BCO-doped sample. These results can be explained by the increased number of defects decreasing the mean free path of electrons and thus lowering the coherence length, which in turn increases Bc2.
“…the rods in BSO doped YBCO rods with undoped YBCO in between 16 . The self-aligned growth has been attributed to strain fields created by the dopant 23 and since BCO itself tends to increase strain in YBCO 8,9 , it likely disturbs the rod formation process. Additionally, in m100 the thickness and distance of the BZO nanorods is the same as in samples with thicker layers but the rods are straight.Figure 2The TEM images of ( a ) m1000ZC and ( b ) m250 showing the interfaces between nanorods and nanodots.…”
Section: Resultsmentioning
confidence: 99%
“…Thus the time it took at 750° C to make a single layer film, like Z, was considerably shorter than the time needed to deposit m100, for example. The BZO and the undoped YBCO targets were made using sol-gel method 39,40 , implying nanosized grains in the targets and BCO doped using solid state reaction 8 , implying micron sized grains. The target containing both 2 wt-% BCO and 2 wt-% BZO was also made using solid state reaction.…”
Section: Methodsmentioning
confidence: 99%
“…All these dopants create nanosized rods when deposited using pulsed laser deposition (PLD). However, YBCO has also been doped using materials that result in non-correlated pinning centres, like Y 2 O 3
7 or BaCeO 3
8,9 (BCO). Especially the nanorods are seen to decrease anisotropy and they commonly produce a peak in the angular dependence of J
c when the magnetic field B is parallel to the YBCO c axis and the nanorods.…”
The flux pinning properties of the high temperature superconductor YBa2Cu3O7−δ (YBCO) have been conventionally improved by creating both columnar and dot-like pinning centres into the YBCO matrix. To study the effects of differently doped multilayer structures on pinning, several samples consisting of a multiple number of individually BaZrO3 (BZO) and BaCeO3 (BCO) doped YBCO layers were fabricated. In the YBCO matrix, BZO forms columnar and BCO dot-like defects. The multilayer structure improves pinning capability throughout the whole angular range, giving rise to a high critical current density, J
c. However, the BZO doped monolayer reference still has the most isotropic J
c. Even though BZO forms nanorods, in this work the samples with multiple thin layers do not exhibit a c axis peak in the angular dependence of J
c. The angular dependencies and the approximately correct magnitude of J
c were also verified using a molecular dynamics simulation.
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