Vortex fluctuations effects in the 2D system YBa2Cu3O6.6

Gomis, V.; Catalán, I.; Martı́nez, B.; Gou, A.; Obradors, X.; Fontcuberta, J.

doi:10.1016/0921-4534(94)92532-1

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…In this system, the anisotropy increases with the decrease in the oxygen content. Indeed, a 3D scaling was observed in a fully oxygenated YBa 2 Cu 3 O 7 single crystal, 17 but a 2D scaling was demonstrated 18 in YBa 2 Cu 3 O 6.6 .…”

Section: Introductionmentioning

confidence: 99%

Fluctuations in single-crystalYBa2Cu3O6.5<

et al. 2001

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Magnetization measurements as a function of temperature are reported for YBa 2 Cu 3 O 6.5 crystal (T c ϭ45.2 K) for fields between 0.2 and 3.5 T. All isochamps for HϾ1 T intersect at T 2D Ã Ӎ42.8 K, implying a fluctuation contribution to the magnetization. These curves collapse into a single curve when magnetization and temperature are scaled according to the predicted ''two-dimensional ͑2D͒ scaling'' in the fluctuation regime. Surprisingly, the low-field curves also intersect, at T 3D Ã Ӎ43.4 K, and they obey a 3D scaling. We provide a theoretical picture of the magnetization in the fluctuation regime based on the Lawrence-Doniach model. Within this model we calculate the field and temperature dependence of the magnetization. The two intersection points and the 2D→3D crossover are consistent with the experimental observation.

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Section: Introductionmentioning

confidence: 99%

Fluctuations in single-crystalYBa2Cu3O6.5<

et al. 2001

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“…The Authors [11] shown theoretically and experimentally that the low-field curves producing the higher temperature crossing point obey the three-dimensional-LLL scaling form while the high-field curves producing the lower temperature crossing point obey the two-dimensional-LLL scaling form. Previously, a crossing point of M vsT curves due to 3D vortices fluctuations was observed in Y123 with T c =92 K [9] while a crossing point due to 2D vortices fluctuations was observed in deoxygenated Y123 [14]. Y Ba 2 Cu 3 O 7−x is the most studied high-T c material, and deoxygenated Y123 is a system where reduction of oxygen reduces the superconducting temperature T c and increases the anisotropy [15,16].…”

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confidence: 99%

Dimensional Crossover in the Fluctuation Magnetization in YBa2Cu3O7- x and its Evolution with the Content of Oxygen

et al. 2006

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We have studied the field-induced dimensional crossover in the fluctuation magnetization of three single crystals of Y Ba2Cu3O7−x, with superconducting transition temperatures, Tc= 62.5, 52, and 41 K. The dimensional crossover is observed by studying the diamagnetic vortex fluctuations of the lowest-Landau-level type which occur in isochamps magnetization curves, M vsT , for temperatures close to the transition temperature Tc(H). The study was accomplished by obtaining isochamps magnetization curves as a function of temperature for fields in the range of 0.1 T to 5 T. Magnetization curves for each sample when plotted together show two distinct well resolved crossing points, one formed by low field curves and located at a higher temperature than the other formed by high field curves. A lowest-Landau-level scaling analysis is applied to the curves forming the crossing points and it is verified that lower field curves obey the three-dimensional form of this scaling while the higher field curves obey the two-dimensional form. The results allow to observe the evolution of the dimensional crossover field Hcross, 3D-2D, with the content of oxygen in Y Ba2Cu3O7−x. It is observed that the evolution of the field Hcross with the content of oxygen in each sample qualitatively agrees with theoretical predictions and allow us to estimate the ratio of the anisotropy among the studied samples. pacs74.40.+k

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“…Email: wk.yeoh@usdy.edu.au. large, which limits their effectiveness to act as pinning centers, a well-defined interface between the Y-123 and Y-211 phases of similar dimension to the coherence length, ξ , of the high temperature superconductor has been confirmed to enhance J c over a wide range of temperatures [5,6]. Unfortunately, this interface pinning mechanism is limited by the Ostwald ripening (i.e.…”

Section: Introductionmentioning

confidence: 99%

Control of Y₂BaCuO₅particle formation in bulk, single grain Y–Ba–Cu–O

Yeoh

Pathak

Shi

et al. 2009

Supercond. Sci. Technol.

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The trapped field of undoped, bulk, single grain Y–Ba–Cu–O (YBCO) fabricated by top seeded melt growth (TSMG) has been measured to investigate the field generating potential of this material. Bulk samples were prepared from precursor powders that incorporated Y2O3 of particle size 20–50 nm, rather than Y2BaCuO5 (Y-211), which is used more commonly, in order to introduce nano-Y-211 inclusions in the superconducting YBa2Cu3Oy (Y-123) matrix. Relatively small bulk samples of diameter 20 mm processed from this precursor are observed to trap a peak magnetic flux density of nearly 0.8 T at 77 K. This is the first time that such a trapped field of this magnitude has been observed in undoped YBCO (i.e. in the absence of chemical additions). The increase in trapped field is accompanied by an associated enhancement in Jc by up to a factor of five over the applied magnetic field up to 4 T at 77 K compared to standard single grain YBCO fabricated from precursor powders that contain the Y-211 phase.

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Vortex fluctuations effects in the 2D system YBa2Cu3O6.6

Cited by 6 publications

References 10 publications

Fluctuations in single-crystalYBa2Cu3O6.5<

Fluctuations in single-crystalYBa2Cu3O6.5<

Dimensional Crossover in the Fluctuation Magnetization in YBa2Cu3O7- x and its Evolution with the Content of Oxygen

Control of Y₂BaCuO₅particle formation in bulk, single grain Y–Ba–Cu–O

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Vortex fluctuations effects in the 2D system YBa2Cu3O6.6

Cited by 6 publications

References 10 publications

Fluctuations in single-crystalYBa2Cu3O6.5<

Fluctuations in single-crystalYBa2Cu3O6.5<

Dimensional Crossover in the Fluctuation Magnetization in YBa2Cu3O7- x and its Evolution with the Content of Oxygen

Control of Y2BaCuO5particle formation in bulk, single grain Y–Ba–Cu–O

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Control of Y₂BaCuO₅particle formation in bulk, single grain Y–Ba–Cu–O