Module 2 : Systems under technological importance

Lecture 16: Superconducting Materials

 

Magnetic Flux Quantisation

Magnetic flux enclosed in a superconducting ring = integral multiples of fluxon

Φ = nh/2e = n Φ0 ( Φ0= 2 x 10-15 Wb)

Effect of Pressure

• Pressure ↑ => TC
• High TC superconductors – High pressure

Thermal Properties

• Entropy & Specific heat ↓ at TC
• Disappearance of thermo electric effect at TC
• Thermal conductivity ↓ at TC – Type I superconductors