100 Years of Superconductivity, Professor James Annett
BRLSI (IOP South West Branch)
Prof Annett graduated from
and completed post doctorate studies in Cambridge
before moving to Illinois
in 1994 as a lecturer. Bristol
1897 JJ Thompson discovered electron
1900 Mark Plank quantum physics
1905 Albert Einstein and the photo-electric effect, special relativity and Brownian motion
1908 H Kamerlingh Onnes liquefied helium at 3 degrees Kelvin
1987 James Dewar liquefied hydrogen
ALL the magnetic field, they
are perfect diamagnets.
Þ Electron-lattice attraction near Fermi momentum (Energy level)
Þ Leads to Cooper Pairs of electrons
Þ Near band gap energy (The conduction band electrons are all paired up)
Ø Not as would be expected from nature
Ø Nature NOT symmetrical (!?!)
o Leads to theorized Higgs boson
1986 the Tc (critical temperature for superconductivity) first breached the theorized limit of 30K from
BCS theory (new
types of superconductor invented).
[Random thought: Bionic implant for the eye to assist in eye focussing.]
Binding energy for superconductors attached to magnets
Ø (There are three different mechanisms depending on type of superconductor.)
o doping diagram of superconductivity being affected by alloy being doped
Uses of superconductors in the current world:
· Superconducting power grid
o High density of current
· Superconducting motors
What to expect?
· Possibly reach room temperature superconducting
[Random thought: People must intimidate each other for having good eye-sight in the West generally but this trend is now being reversed and it can be seen that people wearing glasses are now facing the threat of violence for being short-sighted]
The optical properties of superconductors are mainly in the infrared so far (via interaction with Cooper pairs of electrons for bullshit example).
· Possible application in bionic eye implant as a focussing sensor for the eye.
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