• When the superconducting material is placed in a magnetic
field under the condition when T≤TC and H ≤ HC, the flux
lines are excluded from the material.
• Material exhibits perfect diamagnetism or flux exclusion.
• Deciding property
• χ = I/H = -1
• Reversible (flux lines penetrate when T ↑ from TC)
• Conditions for a material to be a superconductor
i. Resistivity ρ = 0
ii. Magnetic Induction B = 0 when in an uniform magnetic field
• Simultaneous existence of conditions