Effect of fast neutron irradiation on magnetic properties of fullerene superconductor Rb3C60 |
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| Authors: | T. Kubo T. Terai A. Suzuki N. Chikumoto |
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| Affiliation: | aThe Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan;bDepartment of Nuclear Engineering and Management, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan;cNuclear Professional School, The University of Tokyo, 2-22 Shirakata-Shirane, Tokai, Naka, Ibaragi 319-1188, Japan;dSuperconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan |
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| Abstract: | Effects of fast neutron irradiation and post-annealing on magnetic properties of Rb3C60 were studied through the dc magnetization measurement. Rb3C60 powder samples were prepared in an evacuated quartz glass tube, and the temperature and the magnetic field dependences of dc magnetization were measured before and after irradiation and after post-annealing. The neutron fluences were 1.0, 1.8 and 3.3 × 1016 n/cm2, and the post-annealing was made at a temperature of 473 K for 3 h. Magnetic hysteresis of the samples irradiated at the fluence of 1.8 and 3.3 × 1016 n/cm2 disappeared, and the hysteresis curves hardly changed at the fluence of 1.0 × 1016 n/cm2. As for the post-annealing effect, the hysteresis curves of the sample irradiated at the fluence of 1.8 × 1016 n/cm2 were completely recovered after annealing, while those of the other samples, which had a magnetic background before irradiation, were not recovered. In this study, it was found that the loss of superconductivity in Rb3C60 powder is observed when the neutron irradiation fluence exceeds 1.0 × 1016 n/cm2, and the lost superconductivity is completely recovered by the post-annealing at 473 K for 3 h. |
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| Keywords: | Fullerene superconductor Neutron irradiation Annealing effect Magnetic properties |
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