21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

M2Or3B-02 [Invited]: Vortex pinning landscape by ion irradiation for REBCO thin films

23 Jul 2019, 16:00
30m
Level 6, Room 12-13 ()

Level 6, Room 12-13

Speaker

Toshinori Ozaki (Kwansei Gakuin University)

Description

Raising critical current density Jc in REBa2Cu3Oy (REBCO, RE: Y and rare earth) tapes is very important for applications such as rotation machineries and wind turbines. Many types of nano-sized precipitates and defects have been formed to enhance vortex pinning, resulting in an increase of Jc under magnetic fields. Ion irradiation is a well-established method for artificially introducing a variety of defects into superconductors in a fairly predictable and controllable manner by opting appropriate ion species and energy. Recently, a low-energy ion irradiation has been revisited as a practically feasible approach to enhance vortex pinning in REBCO tapes. Low-energy ion beam (< several MeV) can produce vacancy-interstitial type of defects, including Frenkel pairs and their clusters along cascades. We have demonstrated an enhancement of Jc by using low-energy ion irradiation, in which we created small cascade and cluster-like defects in iron-chalcogenide superconducting films.[1,2] In this talk, we present systematically the effect of low-energy ion irradiation on superconducting properties in REBCO films by means of both transport and magnetization measurements. We also discuss the relationship between the superconducting properties and the microstructures of REBCO films before and after several types of ion irradiations.
1) T. Ozaki et al., Nat. Commun. 7, 13036 (2016).
2) T. Ozaki et al., Supercond. Sci. Technol. 31, 024002 (2018).

Primary author

Toshinori Ozaki (Kwansei Gakuin University)

Co-authors

Prof. Satoshi Semboshi (Tohoku University) Prof. Tetsuro Sueyoshi (Kumamoto University) Dr Hiroyuki Okazaki (Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology) Dr Hiroshi Koshikawa (Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology) Dr Shunya Yamamoto (Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology) Dr Tetsuya Yamaki (Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology) Dr Hitoshi Sakane (SHI-ATEX Co., Ltd.)

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