Tagged Questions
1
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1answer
67 views
Ginzburg-Landau model for superconductivity
Could someone kindly elaborate more on the Simple Interpretation section from this Wikipedia Article? I refer to the part on the natures of $\alpha , \beta$. Why can one assume that ...
0
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0answers
73 views
Superconductors for sale? [closed]
Does anyone know where I can purchase superconductors for a school presentation? I don't need a whole kit, just the disk itself. Thanks.
5
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2answers
246 views
How do superconducting materials float in magnetic field?
The movie Avatar got me interested in the subject, but so far I only found sophisticated articles loaded with unfamiliar words. Is there a simple way to explain how magnetic field affects ...
0
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0answers
40 views
How fast is an anti-quench?
Is there any evidence it is slower than a quench?
The rapid, energy-rich return of a superconducting electromagnet to the normal state is called a quench, and occurs very rapidly, perhaps almost ...
5
votes
3answers
280 views
Why can't a superconductor make a DC motor self sustaining?
Superconducting wire can host a low current magnetic field. I do not know if it supports a corresponding electrical field.
Can a superconducting wire that sustains a current accelerate a DC motor? ...
2
votes
1answer
115 views
Crystal magnetic response only skin deep?
The Hamiltonian for a single electron in a magnetic field reads
$$H=\left(\frac{{\bf p}^{2}}{2m_{e}}+q_{e}\phi\right)+\mu_{B}\left({\bf \hat{L}}+g{\bf \hat{S}}\right)\cdot{\bf ...
4
votes
2answers
363 views
Aharonov-Bohm Effect and Flux Quantization in superconductors
Why is the magnetic flux not quantized in a standard Aharonov-Bohm (infinite) solenoid setup, whereas in a superconductor setting, flux is quantized?
0
votes
1answer
174 views
Faraday's law and superconductivity
According to Faraday's law of induction, volts = -Number of coils in a solenoid * change in strength of magnet / change in time. This doesn't take into account distance or speed, only time. If amps = ...
3
votes
2answers
649 views
Quantum levitation (locking) 3mm thick disk could carry 1000kg small car claim
I watched this TED presentation: http://www.ted.com/talks/boaz_almog_levitates_a_superconductor.html
It is about superconductivity and quantum levitation. It tells that super-thin, three-inch disk ...
2
votes
1answer
203 views
Strength of Magnetic Field Around a Superconductor
I recently learned that the strength of a Magnetic field around a conductor is proportional to the current flowing in it. So if we have a Mercury wire at absolute zero and pass a current through it ...
1
vote
1answer
189 views
Quantum Locking and gravity
Can a device be constructed of a super conducting disk connected to a electromagnet that generates a field such that the disc locks "in" the field generated by the electromagnet such that the device ...
7
votes
2answers
462 views
How is stable levitation possible?
This question is with reference to the video in this blog post: http://www.universetoday.com/90183/quantum-levitation-and-the-superconductor/
My question is the following: how is the disc stable in ...
8
votes
3answers
1k views
Can superconducting magnets fly (or repel the earth's core)?
If a superconducting magnet and appropriate power supply had just enough $I\cdot s$ (current $\cdot$ length) so that when it was perpendicular to the earth's magnetic field, the force of the ...
0
votes
1answer
144 views
How to apply Andreev reflection formalism to ferromagnet ,normal metal interface?
The traditional formalism for andreev reflection deals with what happens at normal metal, super conductor interface.http://en.wikipedia.org/wiki/Andreev_reflection
(i.e when an electron from normal ...
2
votes
1answer
179 views
What will happen when we cool the permanent magnet?
When we are cooling the permanent magnet what property of magnet changes?
normally the superconductivity of magnets occurs at critical temperature(negative degrees).It is having a long life period and ...
6
votes
3answers
514 views
Measuring the spin of a single electron
Is it possible to measure the spin of a single electron? What papers have been published on answering this question? Would the measurement require a super sensitive SQUID, Superconductive Quantum ...
12
votes
3answers
561 views
Shine a light into a superconductor
A type-I superconductor can expel almost all magnetic flux (below some critical value $H_c$) from its interior when superconducting. Light as we know is an electromagnetic wave. So what would happen ...
