University Deptt. of Physics, L.N. Mithila University, Darbhanga, (Bihar) -846004
*Email: Kumarpramod2009@yahoo.in
Pinning centers arise due to inhomogeneties in a superconductor. Large and randomly arranged pinning centers cause a strong deformation of a flux line lattice, so that each pinning centre acts on the lattice with a maximum force. The temperature and field force dependences are determined by the type of inhomogeneties and their sizes.
Pinning centre, Flux line lattice, Inhomogeneities
