Anisotropic pinning defects in BaZrO3-doped YBa2Cu3O6+x films in high magnetic fields

Traito, K. B.; Сафончик, М.; Peurla, Markus; Huhtinen, H.; Paturi, P.; Shakhov, M. A.; Stepanov, Yu. P.; Laiho, R.

doi:10.1016/j.physc.2008.02.007

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Similar tendency is observed for 4% BZO-doped YBCO sample in the films doped with low BZO concentration or when the BZO nanorods are short [25] while columnar pinning dominates in the films doped with optimal 4% BZO [28]. The intermediate 2.6% BZO concentration demonstrates influence of both pinning contributions to r xy as can be seen from Fig.…”

Section: Discussionsupporting

confidence: 81%

“…Doping with BZO further improves the irreversibility and depinning lines and increases the value of J c in such films [23]. Also angular dependence of the resistivity, the irreversibility field and the critical current of undoped and BZO-doped YBCO films have been investigated in high magnetic fields [28]. These results demonstrate the efficiency of the columnar defects in BZO-doped YBCO films also in magnetic fields much above the matching field.…”

Section: Resultsmentioning

confidence: 72%

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Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
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Section: Discussionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 72%

Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
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0
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“…To our knowledge, this is the first estimation of U 0 in YBCO films using this approach, and the first estimation of U 0 in YBCO thick films (BZO-doped or pure, from nanoor microcrystalline targets). For comparison, in the case of films (150 nm), magnetoresistance measurements and subsequent theoretical analysis gave U 0 (77 K, 15 T) ∼ = 68 K for films ablated from a nYBCO/BZO target, as compared with 36 K for films ablated from a microcrystalline target [24].…”

Section: Resultsmentioning

confidence: 99%

Critical current density and pinning potential in YBa₂Cu₃O_7−δthick films ablated from a BaZrO₃-doped nanocrystalline target

Crisan

Kechik

Mikheenko

et al. 2009

Supercond. Sci. Technol.

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We report on the pulsed laser deposition and characterization of thick (1.27 µm) films ablated from a nanocrystalline YBa2Cu3O7−δ (YBCO) target doped with 4 wt% BaZrO3 (BZO), nYBCO/BZO. DC magnetization measurements have shown a four- to five-fold increase in the critical current density Jc and a three- to four-fold increase in the maximum pinning force in comparison with 1 µm thick films grown from a commercial microcrystalline YBCO target, at both 77.3 and 65 K. We have found that the frequency-dependent critical current densities Jc(f0/f) estimated from susceptibility measurements are linear in a double-logarithmic plot (where f is the frequency of the AC field and f0 is a macroscopic attempt frequency of about 106 Hz), consistent with a logarithmic dependence of the pinning potential on the current density, and are again several times higher in nYBCO/BZO thick films. From the slopes of the Jc(f0/f) dependences we have also estimated the values of pinning potentials in fields between 3 and 5 T.

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“…BZO has been found to increase the dislocation concentration and it induces extended columnar linear defects in the films [18]- [20]. It has been also shown on YBCO that use of a nanograined target materials remarkably enhances [21], [22], irreversibility field [19], [23] and accommodation field [24]. In this paper, we report the effect of BZO-doping in GdBCO films deposited from nanograined target materials on (100) (STO) substrate.…”

Section: Introductionmentioning

confidence: 89%

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Schlesier

Huhtinen

Paturi

et al. 2009

IEEE Trans. Appl. Supercond.

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We report the effect of 4 wt% BZO-doping in GdBCO thin films on (100) STO substrates with novel nanograined target materials deposited by pulsed laser deposition (PLD) method. X-ray diffraction, atomic force microscopy and magnetization measurements, which were made in particularly wide temperature and magnetic field range, were used to determine the structural and superconducting properties. The results were compared with ones of YBCO. The deposition temperature, s , is not very critical for GdBCO and it is found to be much lower in undoped and BZO-doped GdBCO than in YBCO. The BZO-doping of GdBCO enhanced the field dependence of critical current density, c , at low temperatures. Furthermore, BZO-doping enhances the accommodation field, , below 60 K being clearly higher at 10 K in doped GdBCO than in YBCO. The pinning mechanism in GdBCO was concluded to be similar to that of YBCO. Our results clearly show that undoped and BZO-doped nanophase GdBCO is a very promising target material for applications as well as for coated conductors.

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Anisotropic pinning defects in BaZrO3-doped YBa2Cu3O6+x films in high magnetic fields

Cited by 8 publications

References 31 publications

Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
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0
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Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
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0
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Critical current density and pinning potential in YBa₂Cu₃O_7−δthick films ablated from a BaZrO₃-doped nanocrystalline target

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

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Anisotropic pinning defects in BaZrO3-doped YBa2Cu3O6+x films in high magnetic fields

Cited by 8 publications

References 31 publications

Hall effect and pinning regimes in YBa2Cu3O6+xСафончик1, Traito2, Tuominen3 et al. 2009Physica C: Superconductivity and its ApplicationsSelf Cite3000View full textAdd to dashboardCite

Hall effect and pinning regimes in YBa2Cu3O6+xСафончик1, Traito2, Tuominen3 et al. 2009Physica C: Superconductivity and its ApplicationsSelf Cite3000View full textAdd to dashboardCite

Critical current density and pinning potential in YBa2Cu3O7−δthick films ablated from a BaZrO3-doped nanocrystalline target

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

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Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
Self Cite
3
0
0
0
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Hall effect and pinning regimes in YBa2Cu3O6+x
Сафончик
¹
,
Traito
²
,
Tuominen
³

et al. 2009
Physica C: Superconductivity and its Applications
Self Cite
3
0
0
0
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Critical current density and pinning potential in YBa₂Cu₃O_7−δthick films ablated from a BaZrO₃-doped nanocrystalline target