superconductivity (1 Viewer)

[xeriphic]

the book states that

The phenomenon called superconductivity is when some materials which are cooled to low temperatures they actually become perfect conductors at temperatures above absolute zero, a result that contradicts the free-electron model.

so does it mean that the materials is first cooled then raise to temperature above zero for it to conduct

 

[pc_wizz]

no..

for a substance to become superconductive it needs to reach a temperature at or below its "critical temperature."

for eg ... Yttrium Barium Copper Oxide has a critical temperature around ~91K ...

so u can use Liquid Nitrogen to cool it ...

in otherwords u just need a temperature at or less than its critical temperature ..

pcwizz

 

[pc_wizz]

i shud say that the cooling material needs to be able to cool to the critical temperature ..

with the eg above liquid N2 can cool to < 90K ...

pcwizz

 

[rumour]

Originally posted by xeriphic
the book states that

The phenomenon called superconductivity is when some materials which are cooled to low temperatures they actually become perfect conductors at temperatures above absolute zero, a result that contradicts the free-electron model.

so does it mean that the materials is first cooled then raise to temperature above zero for it to conduct

Zero & absolute zero are 2 different things!

 

[Xayma]

Originally posted by xeriphic
the book states that

The phenomenon called superconductivity is when some materials which are cooled to low temperatures they actually become perfect conductors at temperatures above absolute zero, a result that contradicts the free-electron model.

so does it mean that the materials is first cooled then raise to temperature above zero for it to conduct

Basically whats it saying is that superconductivity contradicts the free-electron model as they are superconductors above absolute zero (in the free electron model the only superconductors would be when at absolute zero)

 

[xeriphic]

i'm getting more and more confused, what does that say about the superconductivity effects and how does it contradict

 

[Xayma]

At any temperature other then absolute zero, there will be vibration inside the lattice which would in theory impede the electrons.

At absolute zero there wont be vibrations hence no resistance.

 

[za]

.

 

[xeriphic]

lol i see now, thanks for the explanation