Defect cascades produced by neutron irradiation in YBa2Cu3O7−δ

Frischherz, M. C.; Kirk, Marquis A.; Farmer, J. W.; Greenwood, Lawrence R.; Weber, H.W.

doi:10.1016/0921-4534(94)90790-0

Cited by 78 publications

(34 citation statements)

References 42 publications

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“…We note that besides the clearly visible cascade, there is also a curvature of the lattice fringe inwardly directed, which produces strain field around the cascade defect. Similar strain fields created by low-energy proton and neutron irradiation were observed in YBCO single crystals from a previous TEM study5152. Although the size of the cascade defects is about 1∼2 nm in diameter and ∼10 nm wide, the strain fields are expected to extend far out to the cascade defect, especially in the radial direction and, as a result, can cause the local lattice distortion.…”

Section: Resultssupporting

confidence: 68%

A route for a strong increase of critical current in nanostrained iron-based superconductors

et al. 2016

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The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.

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Section: Resultssupporting

confidence: 68%

A route for a strong increase of critical current in nanostrained iron-based superconductors

et al. 2016

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“…Linear scaling of and (normal state resistivity) with , in YBCO, for several ions with was reported by [6], too, and suggested earlier by [22] using Ar, Ne, N, and Be ions. In this case uncorrelated defects are expected, as in the case of irradiation with protons or neutrons [23], [24]. Similar relationship between and was also observed in low-superconductors, for the same type of defects.…”

Section: Background: Energy Loss By Ions In Htssupporting

confidence: 72%

Universal Dependence of the Critical Temperature in HTS on the Fractional Volume of Nanosize Defects

Gandini

Weinstein

Sawh

et al. 2007

IEEE Trans. Appl. Supercond.

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We report on the effect of randomly-distributed amorphous defects, at the length scale of the superconducting coherence length, on in YBCO. These damages were created by ions irradiation with a wide range of energy and fluence. Typically, in previous experiments, was found to vary with ion fluence, species, energy, and ionization charge, and also on the chemical composition and density of the HTS. Neither a phenomenological nor a theoretical relationship between and these ion properties is however known of. We now show that the decrease in is a universal function of the fractional defect volume embedded in the HTS. We also re-analysed several experiments by others, and find that the same universality applies. This finding provides, for the first time, a means to calculate the effect on of disorder as created by randomly-distributed amorphous nanosize defects.

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“…100,118,119 This is caused by the defect formation process in this class of materials, where the energy transfer from a fast neutron to the crystal lattice leads to the formation of so-called "collision cascades," which were found by TEM to consist of an amorphous core with a diameter of ∼ 3 nm, surrounded by a strain field of approximately the same size. 120,121 In fact, the fast neutron transfers sufficient energy to the primary knock-on atom (> 1 keV) to initiate a whole cascade of further collisions with neighboring atoms. In the end, this leads to local melting of the lattice and to the creation of an amorphous (or re-crystallized, but oxygen depleted) spherical volume (Fig.…”

Section: High Temperature Superconductorsmentioning

confidence: 99%

Radiation Effects on Superconducting Fusion Magnet Components

Weber

2011

Int. J. Mod. Phys. E

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Nuclear fusion devices based on the magnetic confinement principle heavily rely on the existence and performance of superconducting magnets and have always significantly contributed to advancing superconductor and magnet technology to their limits. In view of the presently ongoing construction of the tokamak device ITER and the stellerator device Wendelstein 7X and their record breaking parameters concerning size, complexity of design, stored energy, amperage, mechanical and magnetic forces, critical current densities and stability requirements, it is deemed timely to review another critical parameter that is practically unique to these devices, namely the radiation response of all magnet components to the lifetime fluence of fast neutrons and gamma rays produced by the fusion reactions of deuterium and tritium. I will review these radiation effects in turn for the currently employed standard "technical" low temperature superconductors NbTi and Nb 3 Sn, the stabilizing material (Cu) as well as the magnet insulation materials and conclude by discussing the potential of high temperature superconducting materials for future generations of fusion devices, such as DEMO.

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Defect cascades produced by neutron irradiation in YBa2Cu3O7−δ

Cited by 78 publications

References 42 publications

A route for a strong increase of critical current in nanostrained iron-based superconductors

A route for a strong increase of critical current in nanostrained iron-based superconductors

Universal Dependence of the Critical Temperature in HTS on the Fractional Volume of Nanosize Defects

Radiation Effects on Superconducting Fusion Magnet Components

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