Vibrating. Head. Control Units(3). H , T and M. ZFC , FC. Sample Holder. Sample Zone. The Sample. (GPIB). Pickup Coils. Special Program. Magnetic Coils. Scaling of the pinning force in MgB 2 superconductor. Kh. A. Ziq*, Hala Hashem
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
H , T and M.
ZFC , FC
Scaling of the pinning force in MgB2
Kh. A. Ziq*, Hala Hashem
Department of Physics, King Fahd University of Petroleum and Minerals
Dhahran Saudi Arabia 31261
Contact: [email protected]
GdG0 0 MRad.
GdG1 10 MRad.
Hysteresis loops measurements have been performed on MgB2 superconductor. The thermodynamic critical field (Hc) has been used to search for universal behavior in the critical field and pinning force in the vortex state. This scaling behavior has been found to be having advantage over the traditional scaling behavior commonly applied to wide class of superconducting materials.
Solid State Reaction
Co60 gamma source
Doses ~ 7MRad/h
Gamma Ray effects on
Magnetic and superconducting properties of GdBa2Cu3O7
Mr Jc Pf Ms
The Co-60 source emits two g photons (1.33 and 1.17 MeV) per disintegration and its activity was 244 kGy (9.03 PBq).
Max T at the surface of the samples during irradiation 41 C.
high fields effects.
High T and low H
Defects radius ~1/(H)0.5
Remanent Magnetization and Pinning Forces
An increase in pinning at low Gamma radiation levels
At high fields; Defects radius ~1/sqrt(H).
A slight decrease in Ordering temperature with Gamma doses.
Little effects on Ms.
Gd123 is more resistive to Gamma radiation than Y123,