Nanostructuring of high- TC superconductors via masked ion irradiation for efficient ordered vortex pinning

2014 ◽  
Vol 506 ◽  
pp. 195-200 ◽  
Author(s):  
J. Trastoy ◽  
V. Rouco ◽  
C. Ulysse ◽  
R. Bernard ◽  
G. Faini ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Vortex Pinning ◽  
High Tc Superconductors ◽  
High Tc

Anisotropy-enhanced vortex pinning by randomly splayed extended defects in high-Tc superconductors

2000 ◽  
Vol 335 (1-4) ◽  
pp. 144-147 ◽  
Author(s):  
L Krusin-Elbaum ◽  
G Blatter ◽  
J.R Thompson ◽  
J Ullmann ◽  
C.W Chu
Keyword(s):  
Vortex Pinning ◽  
Extended Defects ◽  
High Tc Superconductors ◽  
High Tc

Anomalous Hall effect and vortex pinning in high-Tc superconductors

2001 ◽  
Vol 364-365 ◽  
pp. 518-521 ◽  
Author(s):  
W Lang ◽  
W Göb ◽  
J.D Pedarnig ◽  
R Rössler ◽  
D Bäuerle
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Vortex Pinning ◽  
High Tc Superconductors ◽  
High Tc

Radiation Damage in Thin Films of High Tc Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
G. J. Clark ◽  
F. K. Legoues ◽  
A. D. Marwick ◽  
R. B. Laibowitz ◽  
R. H. Koch
Keyword(s):  
Thin Films ◽  
Radiation Damage ◽  
Ion Irradiation ◽  
Epitaxial Films ◽  
Microstructural Properties ◽  
Polycrystalline Films ◽  
High Tc Superconductors ◽  
High Tc ◽  
Superconducting Transitions

ABSTRACTUsing O and As ions, we have investigated the effects of ion irradiation on the superconducting, electrical and microstructural properties of thin films of Y1Ba2Cu3Ox. Superconducting transitions were found to degrade in polycrystalline films by a decoupling of the superconducting grains while epitaxial films degrade due to bulk damage. Damage in the films was a result of elastic rather than electronic processes. Evidence is presented for 1D normal conductivity in the films.

Anisotropic changes induced by ion irradiation on Bi-based high Tc superconductors

1993 ◽  
Vol 87 (12) ◽  
pp. 1129-1131 ◽  
Author(s):  
N.M. Hamdan ◽  
Kh.A. Ziq ◽  
A.B. Hallak ◽  
H. Özkan
Keyword(s):  
Ion Irradiation ◽  
High Tc Superconductors ◽  
High Tc

scholarly journals Modification of Critical Current Density Anisotropy in High-Tc Superconductors by Using Heavy-Ion Irradiations

2021 ◽  
Vol 5 (2) ◽  
pp. 16
Author(s):  
Tetsuro Sueyoshi
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Tc Superconductors ◽  
High Tc ◽  
Heavy Ion Irradiation ◽  
The Magnetic Field

The critical current density Jc, which is a maximum value of zero-resistivity current density, is required to exhibit not only larger value but also lower anisotropy in a magnetic field B for applications of high-Tc superconductors. Heavy-ion irradiation introduces nanometer-scale irradiation tracks, i.e., columnar defects (CDs) into high-Tc superconducting materials, which can modify both the absolute value and the anisotropy of Jc in a controlled manner: the unique structures of CDs, which significantly affect the Jc properties, are engineered by adjusting the irradiation conditions such as the irradiation energy and the incident direction. This paper reviews the modifications of the Jc anisotropy in high-Tc superconductors using CDs installed by heavy-ion irradiations. The direction-dispersion of CDs, which is tuned by the combination of the plural irradiation directions, can provide a variety of the magnetic field angular variations of Jc in high-Tc superconductors: CDs crossing at ±θi relative to the c-axis of YBa2Cu3Oy films induce a broad peak of Jc centered at B || c for θi < ±45°, whereas the crossing angle of θi ≥ ±45° cause not a Jc peak centered at B || c but two peaks of Jc at the irradiation angles. The anisotropy of Jc can also modified by tuning the continuity of CDs: short segmented CDs formed by heavy-ion irradiation with relatively low energy are more effective to improve Jc in a wide magnetic field angular region. The modifications of the Jc anisotropy are discussed on the basis of both structures of CDs and flux line structures depending on the magnetic field directions.

The many faces of STEM in materials science

1991 ◽  
Vol 49 ◽  
pp. 440-441
Author(s):  
John Silcox
Keyword(s):  
Materials Science ◽  
Auger Spectroscopy ◽  
Dark Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Acoustic Environment ◽  
Electromagnetic Vibration ◽  
The Many ◽  
Serial Mode

Determination of the microstructure and microchemistry of small features often provides the insight needed for the understanding of processes in real materials. In many cases, it is not adequate to use microscopy alone. Microdiffraction and microspectroscopic information such as EELS, X-ray microprobe analysis and Auger spectroscopy can all contribute vital parts of the picture. For a number of reasons, dedicated STEM offers considerable promise as a quantitative instrument. In this paper, we review progress towards effective quantitative use of STEM with illustrations drawn from studies of high Tc superconductors, compound semiconductors and metallization of H-terminated silicon.Intrinsically, STEM is a quantitative instrument. Images are acquired directly by detectors in serial mode which is particularly convenient for digital image acquisition, control and display. The VG HB501A at Cornell has been installed in a particularly stable electromagnetic, vibration and acoustic environment. Care has been paid to achieving UHV conditions (i.e., 10-10 Torr). Finally, it has been interfaced with a VAX 3200 work station by Kirkland. This permits, for example, the acquisition of bright field (or energy loss) images and dark field images simultaneously as quantitative arrays in perfect registration.

Crystal chemistry of high-Tc superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 1118-1119
Author(s):  
Maryvonne Hervieu
Keyword(s):  
Oxygen Deficiency ◽  
Large Family ◽  
Copper Oxides ◽  
High Tc Superconductors ◽  
High Tc ◽  
Single Mechanism ◽  
Square Planar ◽  
History Of ◽  
Bismuth Cuprates ◽  
New Compounds

Four years after the discovery of superconductivity at high temperature in the Ba-La-Cu-O system, more than thirty new compounds have been synthesized, which can be classified in six series of copper oxides: La2CuO4 - type oxides, bismuth cuprates, YBa2Cu3O7 family, thallium cuprates, lead cuprates and Nd2CuO4 - type oxides. Despite their quite different specific natures, close relationships allow their structures to be simply described through a single mechanism. The fifth first families can indeed be described as intergrowths of multiple oxygen deficient perovskite slabs with multiple rock salt-type slabs, according to the representation [ACuO3-x]m [AO]n.The n and m values are integer in the parent structures, n varying from 0 to 3 and m from 1 to 4; every member of this large family can thus be symbolized by [m,n]. The oxygen deficient character of the perovskite slabs involves the existence or the co-existence of several types of copper environment: octahedral, pyramidal and square planar.Both mechanisms, oxygen deficiency and intergrowth, are well known to give rise easily to nonstoichiometry phenomena. Numerous and various phenomena have actually been characterized in these cuprates, strongly depending on the thermal history of the samples.

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