All Questions
Tagged with cryogenics superconductivity
19
questions
0
votes
0
answers
22
views
Why do cryogenic temperatures usually result in higher conductivity, even (sometimes) superconductivity, but otherwise nonconductive Wigner crystals?
Wigner crystals are all the rage in the news, since around the start of the pandemic...
But at what temperatures (and pressures?) do these cold materials create a nonconducting 'Wigner crystal' rather ...
- 4,515
1
vote
2
answers
60
views
What is the lower limit for experimentally measuring $T_c$ of superconductors?
I'm pretty new to this topic, but find it interesting, so please bear with me.
Since superconductors with $T_c \approx 4.2\text{K}$ have been measured, I wonder, is it possible to have superconductors ...
- 11
-5
votes
1
answer
136
views
Is superconductance restricted to an extremely low temperature? Or can it be effectively replicated using some other technique? [closed]
A type of electrical amplifier is proposed in which only magnetism and it’s analogous current exists for the most part. There is no voltage and no wattage (to speak of) in which electricity has to ...
- 1
2
votes
1
answer
77
views
Superinsulator infinite voltage
Everybody knows about superconductivity, at cryogenic temperatures conductor resistance drops to zero for direct current. There is lesser known related phenomena called superinsulator where material ...
- 119
1
vote
0
answers
78
views
How to measure critical current of a superconducting wire, if my current source can only supply a small current?
I need to determine the critical current of an aluminum wire at 0.1Kelvin. I have access to dilution fridges, but I cannot modify the wiring in the system from room temperature to the sample space. ...
- 185
1
vote
0
answers
61
views
Are there substances that behave as perfect conductors but not superconductors?
Does there exist substances which below a certain temperature becomes as a perfect conductor but not a superconductor? A superconductor is both a perfect conductor as well as a perfect diamagnet. If ...
- 11.8k
1
vote
0
answers
298
views
Do good conductors conduct at absolute zero?
The temperature coefficient of good conductors like metal is positive. So with increase in temperature resistance increases and conductance decreases. With decrease in temperature resistance decreases ...
0
votes
3
answers
1k
views
Do metals at low temperature follow Ohm's law?
I think metals at low temperature do not follow Ohm's because of superconductivity. Is it true? What about metals at high temperature?
- 13
2
votes
0
answers
210
views
Would there be any current if an electric circuit is cooled to absolute zero?
My question is if I got a superconductor and cool it to absolute zero at least measurable by today's tool, it should have no electrical resistance but then would there be any current when there is a ...
- 13k
1
vote
1
answer
72
views
Is there any positive temperature from which superconductivity ceases?
From what I understand about superconductivity, it is due to a coupling between Cooper pairs and phonons. At the absolute 0, there is no phonon, so I assume superconductivity cannot exist at that ...
27
votes
4
answers
8k
views
Are room temperature superconductors theoretically possible, and through what mechanism?
At the moment, the highest critical temperature superconductor known to science (or myself, at least) is mercury barium calcium copper oxide. With a $T_{c}$ of roughly 133 K, that's well above the ...
- 2,714
1
vote
2
answers
137
views
Could superconducting magnets be used to form a shield around a spacecraft?
If superconducting magnets could be used in space to form a field around a spacecraft of a similar field strength on the earth 25 to 65 microtesla's?
Would the temperature in space at -246c be OK for ...
- 11
11
votes
1
answer
432
views
Is there a database or a classification of High-temperature superconductors?
I was wondering if there exists a list with all (or most of) the High-$T_c$ superconductor materials.
In particular I'd like to know if there are databases or review that classifies them by their ...
- 331
5
votes
2
answers
2k
views
1D superconductivity does not exist even at zero temperature?
In class Professor claimed that 1D superconductivity does not exist even at zero temperature. I did a preliminary search and found papers on 1D superconductors. Did I or the Prof make a mistake or ...
- 351
1
vote
1
answer
85
views
How to choose which atoms to cool using optical cooling technology?
Which atoms are easiest to cool down to very low temperatures (e.g. mK)? Which quantities does one need to look at?
My very naive guesses so far are:
Their mass: the heavier they are they least ...
- 24.9k