START. What’s “SUPER” about SUPERCONDUCTORS? Clarina R. dela Cruz High Pressure and Low Temperature Laboratory Texas Center for Superconductivity University.

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Presentation transcript:

START

What’s “SUPER” about SUPERCONDUCTORS? Clarina R. dela Cruz High Pressure and Low Temperature Laboratory Texas Center for Superconductivity University of Houston

metals wood Conductors vs. Insulators plastics All electrons are PAIRED FREE ELECTRONS

What is Resistance? What is Resistance? ELECTRIC FIELD VOLTAGE DIFFERENCE IONS (+) ELECTRONS (-)

conductors superconductors T c  critical temperature R=0 Zero resistance Zero power loss

BCS Theory John Bardeen Leon Cooper John Schrieffer (1957) No collisions Zero resistance

The Meissner-Ochsenfeld Effect Walter Meissner Robert Ochsenfeld (1933) T>T C T<T C Superconductor Magnet DIAMAGNETISM ?

Properties of a Superconductor Zero resistance diamagnetism

295 K,room temp 373 K,BP of water 273 K,FP of water 77 K,Liquid Nitrogen 4.2 K,Liquid Helium

Low -T c Superconductivity Heike Kamerlingh Onnes (1911)

LOW-t C Superconductors Lead (Pb) Mercury (Hg) Aluminum (Al) Gallium (Ga) Molybdenum (Mo) Zinc (Zn) Zirconium (Zr) Americium (Am) Cadmium (Cd) Ruthenium (Ru) Titanium (Ti) Uranium (U) Hafnium (Hf) Iridium (Ir) Beryllium (Be) Tungsten (W) Platinum (Pt)* Rhodium (Rh) K 4.15 K K K K 0.85 K 0.61 K 0.60 K K 0.49 K 0.40 K 0.20 K K K K K K K

High-T c Superconductivity Alex Müller and Georg Bednorz Paul Chu 164 K

295 K,room temp 373 K,BP of water 273 K,FP of water 77 K,Liquid Nitrogen 4.2 K,Liquid Helium 138 K,Highest Tc for HgBaCaCuO

Applications

What lies ahead? Search for more efficient cryogenic cooling ROOM TEMPERATURE SUPERCONDUCTIVITY ?

REFERENCES