5G50.50 High Tc Superconductor
A NdBFe magnet levitates above a high Tc superconductor when it is superconducting. Note: with the video camera, this demonstration is appropriate for large lecture halls.
-  High Tc YBaCuO superconductor with a piece of yellow tape affixed to the top surface (for visibility)
-  Small NdBFe magnet
-  Petri dish
-  Foam support
-  Pair of plastic forceps
-  Small wire hoop
-  Foam cup
-  Video camera
-  Small (~2L) dewar of liquid nitrogen
-  Safety goggles
-  Safety glove
- Place the petri dish on the foam support.
- Place the superconductor in the petri dish.
- Center the NdBFe manget on the superconductor using the forceps.
- Liquid nitrogen can cause severe burns and blindness. Use with caution.
- The magnet is strong. Handle with care.
- The superconductor is brittle. Handle with care.
- Pour liquid nitrogen into the petri dish until the superconductor is fully submerged. WEAR APPROPRIATE SAFETY GEAR.
- Continue to add liquid nitrogen as it boils off. When the superconductor reaches critical temperature (~90K), it will superconduct and the magnet will levitate. Be patient; this can take a while.
- Spin the magnet with the forceps.
- Pass the wire hoop around the magnet to show it is levitating.
- Gently push the magnet with the forceps to demonstrate its range of stability over the superconductor.
- PIRA 5G50.50
- Don't attempt this at home!
- Wire Coil in Liquid Nitrogen
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.