Low-field flux pinning in twinned and detwinned single crystals of YBa2Cu3O7−<i>x</i>

Swartzendruber, L. J.; Kaiser, Debra L.; Gayle, Frank W.; Bennett, L. H.; Roytburd, Alexander L.

doi:10.1063/1.105180

Cited by 33 publications

(3 citation statements)

References 16 publications

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“…Both multilayers and random nanoparticulate pinning centers of nonsuperconducting second phase materials can be introduced depending upon the technique used [16]. Magnetic doping in YBCO has an important effect on the critical temperature T c and the critical current density J c [17][18][19][20][21]. The present work aims to study the effect of nano magnetic and nonmagnetic doping on the critical temperature of YBCO superconductors.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Salama

El-Hofy

Rammah

et al. 2015

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Bulk superconductor samples of YBa 2 Cu 3 O 7−δ (YBCO) doped with nano metal oxides of Mn 3 O 4 , Co 3 O 4 , Cr 2 O 3 , CuO and SnO 2 respectively with 0.2 wt% are synthesized by a solid-state reaction route. The structural characterization of all samples has been carried out by x-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The XRD patterns indicate that the magnetic doping of nano metal oxides Mn O , Co O , Cr O 3 4 3 4 2 3( ) gives a high value of orthorhombicity of the YBCO samples which is the result of high oxygen content, and consequently could give better superconducting properties contrary to the non magnetic nano oxides (CuO, SnO 2 ). The critical temperature (T c ) of the studied samples was found to improve by nano magnetic doping and lower with nano nonmagnetic doping. The superconducting transition temperature Tc determined from electrical resistivity measurements was found to increase for Mn 3 O 4 (5.27 μB) doping and decrease for other metal oxides doping.

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Section: Introductionmentioning

confidence: 99%

Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Salama

El-Hofy

Rammah

et al. 2015

Adv. Nat. Sci: Nanosci. Nanotechnol.

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“…After the size of the grains are maximized by the use of SmBCO or NdBCO seeds and an optimization of the growth conditions of YBCO during melt texturing, the J c of the grains can be enhanced by the introduction of crystal defects which tend to suppress local superconductivity in YBCO. These defects include oxygen vacancies, (110) twins, dislocations, 211 inclusions, associated strain fields and columnar defects generated by high-energy irradiation [13][14][15]. The flux pinning force is most effective when the size of the regions with suppressed superconductivity is close to the coherence length of YBCO, being a few nanometres.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in transport properties of seeded melt-textured YBCO by Cu-site doping

Tang

et al. 2002

Supercond. Sci. Technol.

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A significant research effort has been made worldwide to introduce nanometre-scale weak superconducting regions into seeded melt-textured superconductors to enhance their critical current density, trapped magnetic field and levitation force. The enhancement in these properties is dependent on the pinning forces exerted on the magnetic flux lines. In this paper we present a substantial improvement in the transport properties of these materials by optimizing the fabrication conditions, controlling the oxygen deficiency, as well as adjusting the doping level of Zn in YBa2(Cu1−xZnx)3O7−δ large grains. The enhancement is found to be as much as 30% by doping between about x = 0.001 25 and 0.002 53. The results strongly indicate that the introduction of local nanometre-scale weak superconducting regions by Zn substitution for Cu in the CuO2 plane enhances the transport properties. Due to the simplicity of the processing conditions, these doping techniques can have a significant potential for a variety of engineering applications.

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“…Twin boundaries are a very common defect found in Y Ba 2 Cu 3 O 7−x (YBCO) and their pinning properties have been extensively studied using Bitter decoration [2], torque magnetometry [3], magnetization [4][5][6][7] transport [8], magneto-optical imaging [9][10][11][12][13][14], and theoretical studies [15][16][17]. Many of the earlier experiments on twinned YBCO samples found conflicting evidence for the role of twin boundaries in vortex pinning.…”

Section: Introductionmentioning

confidence: 99%

Dynamic vortex phases and pinning in superconductors with twin boundaries

2000

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We investigate the pinning and driven dynamics of vortices interacting with twin boundaries using large scale molecular dynamics simulations on samples with near one million pinning sites. For low applied driving forces, the vortex lattice orients itself parallel to the twin boundary and we observe the creation of a flux gradient and vortex free region near the edges of the twin boundary. For increasing drive, we find evidence for several distinct dynamical flow phases which we characterize by the density of defects in the vortex lattice, the microscopic vortex flow patterns, and orientation of the vortex lattice.We show that these different dynamical phases can be directly related to microscopically measurable voltage-current V (I) curves and voltage noise. By conducting a series of simulations for various twin boundary parameters we derive several vortex dynamic phase diagrams.

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Low-field flux pinning in twinned and detwinned single crystals of YBa2Cu3O7−x

Cited by 33 publications

References 16 publications

Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Enhancement in transport properties of seeded melt-textured YBCO by Cu-site doping

Dynamic vortex phases and pinning in superconductors with twin boundaries

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