A The difference between the binding of molecules and superconductors

annaphys
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Molecules and superconductors bind due to overlaps of the wave functions of the electrons.

1. What is the difference between these two then?
2. Why can't we look at molecules as a macroscopic wave function?
 
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1. Superconductors are made up of molecules (and thus atoms), that's the difference.
2. You can. Just like you could look at your cup of coffee as a macroscopic wave function.

Have I misunderstood what you're asking?
 
Yes you have. I would assume someone who knows about superconductivity would be able to answer the questions.
 
annaphys said:
Molecules and superconductors bind due to overlaps of the wave functions of the electrons.
Uh, so what? That's just math.
annaphys said:
1. What is the difference between these two then?
Have you considered how to actually construct a superconductor at room temperature/pressure vs how molecules are constructed in reality? That should tell you how different they are physically.
annaphys said:
2. Why can't we look at molecules as a macroscopic wave function?
Who is stopping you...? How you interpret the math is your job as a physicist, if this interpretation leads you to an insight, then great. Use that intuition.

Yes, my answers are blunt. Give us more, you obviously have some reason to relate the two ideas. If it's just the wavefunction overlapping idea, then my advice is don't get lost in the math.
 
Superconductors may be viewed at as a Bose-Einstein condensate of charged particles. In usual superconductors, the compound particles are much larger than their mean distance (weak coupling limit) . However, there are superconductors, like bipolarons, where the pairs are much smaller (strong coupling). In molecules, these pairs get bound to nuclei and localized, which destroys superfluidity and superconductivity.
 
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annaphys said:
Molecules and superconductors bind due to overlaps of the wave functions of the electrons.

1. What is the difference between these two then?
With respect to molecules, is one referring to covalent bonding as in molecules like CH4 or CO2, or even long chain hydrocarbons, as opposed to bonding in compounds of metals and semimetals (or non-metals as in O in Cuprates), some of which have superconducting properties below a certain temperature?

I was reflecting on different types of superconductors:
https://en.wikipedia.org/wiki/High-temperature_superconductivity

See also this discussion
https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.379.721&rep=rep1&type=pdf
 
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From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...

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