CHANGE IN SUPERCONDUCTING PROPERTIES OF Bi-2212 SINGLE CRYSTAL DUE TO FAST NEUTRON IRRADIATION FOLLOWED BY THERMAL ANNEALING
スポンサーリンク
概要
- 論文の詳細を見る
Change in superconducting properties due to thermal annealing was investigated on Bi-2212 single crystal specimens irradiated with fast neutrons. The Bi-2212 single crystal specimens (2 mm x 2 mm x 50-80μm) prepared by the floating-zone method (FZ) were irradiated with the fast neutron fluence of 5x10^<18> cm^<-2> in JMTR, JAERI. After irradiation, the specimens were annealed in air at 673 K or 1073 K for 1 h to 3 d. Magnetization curves of the specimens before and after irradiation and annealing were measured with a VSM at 4.3 K, 20 K, 40 K and 60 K as a function of applied magnetic field. The critical current density (J_c) calculated from the magnetization hysteresis and the irreversibility field (B_<irr>) decreased due to the irradiation all over the range of temperature and magnetic field, and they were recovered by thermal annealing. In particular, the J_c values of the specimen annealed at 673 K for 1 to 3 h increased by 2 orders of magnitude larger than that of the specimen before irradiation. On the other hand, annealing at 1073 K showed only a partial recovery in the properties.Bi_2Sr_2CaCu_2O_y Single crystalneutronirradiationthermal anealingcritical current density
- 東北大学の論文
- 1997-03-28
著者
-
Terai T.
Engineering Research Institute University Of Tokyo
-
KOBAYASHI T.
Engineering Research Institute, University of Tokyo
-
ITO Y.
Engineering Research Institute, University of Tokyo