KAJIAN MODEL : PENGARUH EFEK PROKSIMITAS DAN EFEK TAK ISOTROP PADA SIFAT MAGNET SUPERKONDUKTOR MESOSKOPIK TIPE II; MODELLING STUDY : PROXIMITY AND ANISOTROPY EFFECT ON THE MAGNETIC PROPERTIES OF MESOSCOPIC TYPE II SUPERCONDUCTOR

Anwar, Fuad, Pekik Nurwantoro

2015 | Tesis | FMIPA

It has been done the modelling studies of the superconductor magnetic properties, namely the study of the normal superconductor magnetic properties, continued by the study of the proximity effect, the anisotropy effect and finally the both of the proximity effect and the anisotropy effect on the superconductor magnetic properties. The objectives of the studies were the type-II mesoscopic superconductor bounded by the normal specimen, continued by such a material bounded by other material and having anisotropy properties, and finally the type-II mesoscopic superconductor bounded by other material and having anisotropy properties. Those objects were applied by the time dependent external magnetic field. The proximity effect was characterized by the boundary conditions for order parameter and magnetic field and the anisotropy effect was related with the effective mass of the Cooper pairs, namely mc along the x-axis and mab in the yz-plane. The studies were based on the solution of the time-dependent Ginzburg-Landau equations using U methods. The results showed that the lower critical field Hc1(T) decreases when the size of material increases, the extrapolation length b decreases at the small size of the material, and the anisotropy mass ratio m increase at m 1. The Hc1(T) increases when b increases at the large size of the material and m increases at m 1. The surface critical field Hc3(T) decreases when the size of material increases. The Hc3(T) increases when b or m increases.

Kata Kunci : time-dependent Ginzburg-Landau equations; proximity effect; anisotropy effect