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Zhukov, A.A.; Küpfer, H.; Claus, H.; Wühl, H.; Kläser, M.; Müller‐Vogt, G.

doi:10.1103/physrevb.52.r9871

Cited by 78 publications

(35 citation statements)

References 21 publications

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“…15,25 In twinfree crystals, the PE has been related to intrinsic pinning from CuO planes or second-phase impurities. In twinned YBCO crystals the peak has been found to depend strongly on the orientation of the applied field relative to the twin planes.…”

Section: Discussionmentioning

confidence: 99%

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
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We have investigated the dynamics of vortices at subcritical microwave currents in dc magnetic fields ͑up to 0.8 T͒ in epitaxial DyBa 2 Cu 3 O 7Ϫ␦ ͑DBCO͒ thin films. Microwave measurements were performed using microstrip resonators as test vehicles at 4.88 GHz and 9.55 GHz on laser ablated DBCO thin films in the thickness range 1800-3800 Å. Experimental evidence indicates that the peak effect ͑PE͒ observed in surface resistance vs temperature (R s vs T) plots in applied dc magnetic fields up to 0.8 T is primarily due to the extended defects in thinner films ͑1800 Å͒ such as twin boundaries at the substrate(LaAlO 3 )-film interface; whereas, the high density of point defect disorder in thicker (у3000 Å) films is responsible for low R s and high depinning frequency p . This has been confirmed by generation of columnar defects using 200 MeV Ag ion irradiation which showed that even thicker DBCO films show PE in R s after the introduction of columnar defects. Further, DBCO films grown on low-twinned LaAlO 3 substrates ͑which cause low density of substrate-related extended defects in the film͒ have shown PE only

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Section: Discussionmentioning

confidence: 99%

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
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“…[1][2][3][4][5] In the high-T c YBaCuO crystals, the line of the maximum critical current density, H p (T ), frequently lies essentially below the irreversibility line in the H − T plane, [6][7][8][9] and in sufficiently perfect crystals it exhibits nonmonotonic behavior with temperature. [10][11][12][13][14][15][16] In these perfect crystals the line of maximum current density approaches the flux-line melting line, H m (T ), approximately at the so-called upper critical point 17 at which the melting line terminates.…”

Section: Introductionmentioning

confidence: 99%

Peak effect, vortex-lattice melting line, and order-disorder transition in conventional and high-Tcsuperconductors

2001

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We investigate the order-disorder transition line from a Bragg glass to an amorphous vortex glass in the H − T phase diagram of three-dimensional type-II superconductors taking into account both pinning-caused and thermal fluctuations of the vortex lattice. Our approach is based on the Lindemann criterion and on results of the collective pinning theory and generalizes previous work of other authors. It is shown that the shapes of the order-disorder transition line and the vortex lattice melting curve are determined only by the Ginzburg number, which characterizes thermal fluctuations, and by a parameter which describes the strength of the quenched disorder in the fluxline lattice. In the framework of this unified approach we obtain the H − T phase diagrams for both conventional and high-Tc superconductors. Several well-known experimental results concerning the fishtail effect and the phase diagram of high-Tc superconductors are naturally explained by assuming that a peak effect in the critical current density versus H signalizes the order-disorder transition line in superconductors with point defects.

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“…Surprisingly strong flux pinning and a temperature-dependent fishtail have already been used to infer the existence of weak or nonsuperconducting regions in YBCO. 38,39 Because these regions were not directly observed, researchers suggested that twin boundaries trapped flux vortices and increased critical current densities. [38][39][40] Observations that a stronger fishtail effect occurred for samples with lower O content and higher densities of twin boundaries and that the fishtail effect was reduced in samples with low twin-boundary density were both consistent with that conclusion.…”

Section: Resultsmentioning

confidence: 98%

Structural inhomogeneity and twinning inYBa2Cu3O7−δsuperconductors: High-resolution transmission electron microscopy me

2008

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The superconducting properties of YBa 2 Cu 3 O 7-␦ ͑YBCO͒ are strongly dependent on atomic structure and composition. While the average structures of YBCO are well documented, the local oxygen concentration and ordering have received much less attention owing to the difficulty of experiments and analysis. We examined several samples of YBCO by quantitative high-resolution transmission electron microscopy and geometric phase analysis to determine their local atomic structure and symmetry. Our results reveal that adjacent domains separated by the ͑110͒ interfaces, commonly considered to be twin domains, can have different a o / b o ratios. The domains, therefore, do not retain the ideal twinned configuration commonly expected for this system. Assuming the a o / b o ratio is proportional to oxygen concentration, we suggest that these domains result from inhomogeneous oxygen distribution. Multiple measurements in both bulk and thin-film samples indicate that YBCO can consist of different phases, which may yield locally variable superconducting properties.

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Influence of twins on the peak effect and vortex pinning inYBa2Cu3

Cited by 78 publications

References 21 publications

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Peak effect, vortex-lattice melting line, and order-disorder transition in conventional and high-Tcsuperconductors

Structural inhomogeneity and twinning inYBa2Cu3O7−δsuperconductors: High-resolution transmission electron microscopy me

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Influence of twins on the peak effect and vortex pinning inYBa2Cu3

Cited by 78 publications

References 21 publications

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3OBanerjee1, Bagwe2, John3 et al. 2004Phys. Rev. B10150View full textAdd to dashboardCite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3OBanerjee1, Bagwe2, John3 et al. 2004Phys. Rev. B10150View full textAdd to dashboardCite

Peak effect, vortex-lattice melting line, and order-disorder transition in conventional and high-Tcsuperconductors

Structural inhomogeneity and twinning inYBa2Cu3O7−δsuperconductors: High-resolution transmission electron microscopy me

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Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite