Meissner effect Definition and 41 Threads

How do one get the electrons to move inside a superconductor? Since I have understood superconductors repel magnetic fields due to the Meissner effect, or is that when the charges already are moving within the superconductor? If so how did we get them o move from the beginning? Can you make...

I am doing a project where the final scope is to find an extra operator to include in the proca lagrangian. When finding the new version of this lagrangian i'll be able to use the Euler-Lagrange equation to find the laws of motion for a photon accounting for that particular extra operator. I...

One more thing i forgot to add, is magnetic permeability of a metal constant irrespective of its temperature including superconducting temperature ?

Consider the following setup: Stationary magnet and Superconductor are fixed and Moving magnet is allowed to move freely in the horizontal direction. Assume the superconductor as Type I superconductor. Following figure shows the Horizontal Force acting on Moving Magnet vs Distance curve...

A superconductor with little or no magnetic field within it is said to be in the Meissner state. The Meissner state breaks down when the applied magnetic field is too strong. But what happens if an electromagnet that is at first "turned off" is suddenly "turned on", in the close proximity of a...

I've read about the Meissner effect, it seems to suggest that a magnetic field passing through an object gets ejected/repelled (is that the right phrase to use?) from the object after said object has surpassed the critical temperature (i presume pressure as well?)... but what's actually...

How can I measure the levitation forces between the magnets and a type-II superconductor (YBCO superconductor)?

Hello, I am a student in the IB Diploma course. I've decided to focus my essay on quantum locking: including superconductors (YBCO), the Meissner Effect. I have access to the materials needed to experiment with this topic (materials from quantumlevitation.com). Could anyone help me formulate an...

Just a random thought: IF a strong rare Earth magnet and a superconductor like YBCO can perform meissner effect that holds them both in place, is it possible to make that in a larger scale, like in space? I was thinking that since space's temperature is almost 0K, it can cool down...

In superconducting state, If the superconductor and the guide line are stationary, will the force between the the guide line and the superconductor change when they are close to or far away from the magnet?

As shown in the figure, in the Meisner effect, the magnetic field of the magnet bypasses the superconductor. My question is, does the magnetic B field belonging to the magnet increase at the arrow indicating position? Or is there no change in the intensity of the magnetic field that belongs to...

As shown in the figure, the aircraft includes a geomagnetic field convergence layer, which is a superconductor material. The geomagnetic field convergence layer repels the direction of changing the geomagnetic field, so that the geomagnetic field passes between the upper and lower converging...

If we switch a super-conductor between normal and Meissner states, using varying magnetic field, there has to be some delay from when the field exceeds the critical field to the appearance of Meissner state. Have there been any experimental measurements of this delay? What are the measured values?

So I am writing a paper on superconductors, and i am trying to explain the meissner effect. However i seem to be running into conflicting information. I hoping some one can help clarify. The effect happens, when a magnet creates a change in flux, causing a induced current in the...

I'm working on a project of magnetic levitation of the lexus hoverboard Which is based on Meissner effect and suprconductivity and I have to look for contraint, probability, choice, and optimization in this project, i really find a little bit tough where to start this, so if anyone have any...

Hi, I am new to superconductivity and have been doing a lot of reading to try and become familiar with it. I have come across a few questions that I would be grateful is someone could answer. I am confused about the mechanism that describes the expulsion of magnetic fields from inside a...

I read in a book "Optoelectronic Integration: Physics, Technology and Applications" edited by Osamu Wada. Ballistic Conduction and Superconductivity are both electron transport that are not affected by the collisions and scatterings. Ballistic conduction or Ballistic transport occurs when the...

In a field less than critical field, decreasing the temperature below the critical temperature will eliminate the magnetic field inside a superconductor and increase the magnetic field around it. (Meissner effect). But does it related to levitation effect of magnet on a superconductor? What...

I was recently reading about the Meissner effect, in which certain superconductors are able to "exclude" any external magnetic field lines from their interior, as seen in the right half of this diagram: I understand that some superconductors exhibit a sort of imperfect Meissner effect in...

I came up with the following idea of a device: We have a short circuited type-2 (to allow more current) superconducting solenoid. A current is flowing through the solenoid, and it creates magnetic induction inside, B1. Inside the solenoid we place a piece of type-1 superconductor. B1<critical...

So I'm a little confused about the Meissner Effect. If we have both a perfect conductor and a superconductor (both above Tc) and place them in a magnetic field and lower their temperatures so they exhibit their respective properties, the magnetic field inside the perfect conductor persists...

Is it possible that a black hole is so tightly compacted, that its individual particles are unable to move? If this is the case then wouldn't it be extremely cold; close to, or even at absolute zero? Any significant heat would be on the surface caused by friction of attracted matter. With such a...

While studying the M. Effect, a lot of sources state: "If a superconductor is applied in a weak field", I assume the effect would work even in a strong field? Weak or strong I think the Meissner Effect will always be applied as long as the superconductor is below critical temp. Or am I...

I need clarifications on Meissner effect. 1. According to this theory, when any diamagnetic substance is cooled below its critical temperature, it becomes a superconductor and it expels magnetic flux from inside. Is it applicable only to a diamagnetic substance or ferromagnetic substances...

I am trying to understand WHY the Meissner effect occurs NOT WHAT the Meissner effect is. Does it occur because below Tc eddy currents are created in the surface of the material and these oppose and cancel any internal B field. Then above Tc these do not occur and it behaves like a normal...

As i have learnt, the lenz's law is not the cause of the meissner effect.This can also be proved by some experiments.I was wondering what may be the real cause for the meissner effect? As i don't know the cause, i have no idea, in which part of physics i must post this query.

What happens to the electric field of a superconductor that is different to a normal conductor when electricity is going through it anything? Why do surface currents occur on a superconductor are they normally there on a normal conductor?

why shouldn't the meissner effect occur in a non conventional zero material?

Hi, I am quite confused about how the Meissner Effect works. I know that below the critical temperature of a superconductor, it will exclude all magnetic fields going through it. But why is this so? And I also know that as a magnet is brought near the surface of a cooled superconductor...

When we see people levitate a magnet over a superconductor, Does the magnet cause electrons to flow in the superconductor and this creates a B field to hold up the magnet. Is this similar to lenz's law. And why does the stationary magnet cause electrons to flow, I thought we needed a change in...

Hi all .. If a permanent magnet is placed on a superconducting material before cooling to the critical temperature, will this cause the magnet to float after cooling ? if yes, where would the energy come from ? thanks

This has been on my mind for a while now; and I really need some outside input to either expand or put this idea to rest. So this idea relies on the Meissner effect; which during the transition of a material from a natural state to a superconducting state the magnetic permeability of that...

Hi, really quick question. Is there a relationship between the Meissner effect (in superconductors) and Lenz's law. Also, can the Meissner effect alone explain why a magnet can levitate over a superconductor, or do I need to learn about flux trapping (which isn't required by my syllabus).

My question is why does the material having no electrical resistance cause it to repell a magnet? And how can it repell and attract at the same time? I don't understand how the "flux trapping effect" works. I watched this video and it got me really interested in it. Thanks.

Could superconductors be used to focus a magnetic field? For instance, let's say we have a superconducting cylinder and we place a wire coil in one end. If we put current through the wire, could it be used as a more effective Gauss gun than the same coil without the superconducting cylinder?

Check this out: http://www.youtube.com/watch?v=c3asSdngzLs" Why is this so stable? Is i due to the Meissner effect ? I mean you can't do this with two normal magnets. (normal: Tc = 300K+) I was thinking something like since the semiconductor, or what ever it is, becomes a superconducter...

I have been considering a situation, where a piece of superconducting (SC) material is put onto a magnet and then cooled through SC transition. As I understand, repulsion occurs and the SC piece gets away from the magnet (is it correct?). Assuming this happens, the SC piece may shoot upwards...

Hi From what I understand the Meissner effect occurs when a current is induced in a superconductor, from a magnet, giving rise to a magnetic field from the superconductor that opposes the magnet. What stops the magnet from being completely repelled away from the superconductor when it is...

Hi, does anyone know how superconductors will oppose a magnetic flux even if it is unchanging. Thanks

I've just successfully built and tested a superconductor. I've seen the meissner effect in action but there is one thing I'm wondering. If the superconductor is cooled below its critical temperature, and the magnet is then put on top it floats, as it should. It also levitates if the magnet is...

I had to flip a coin between thermo and quantum for this one, so forgive me if the coin made the wrong decision. :) I've been thinking about the Meissner Effect. (Well, a girl's got to think about something, anyway.) Suppose you take a piece of lead and shape it into a paraboloid. Chill...