Superconductivity and magnetism

In summary, certain objects, known as superconductors, can affect the behavior of magnets when they are cooled to very low temperatures. This phenomenon, known as the Meissner effect, is a quantum effect and is a property of certain materials. It does not necessarily violate Maxwell's equations, but requires additional equations to describe the material properties. In most cases, magnetic substances lose their ferromagnetic properties when they become superconductors, though there are some rare materials where both properties can coexist. The exact mechanism for this is still being debated.
  • #1
vincejones
2
0
Certain objects are able to influence the behavior of magnets when super-cooled. Does this violate Maxwells equations?
 
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  • #3
I appreciate the quick response. What happens to the magnetic field of a super-cooled magnet?
 
  • #4
vincejones said:
I appreciate the quick response. What happens to the magnetic field of a super-cooled magnet?

Magnetic substances don't become superconductors when cooled, or at least, they loose their ferromagnetic properties when transitioning into the superconductive regime.
 
  • #5

1. What is superconductivity?

Superconductivity is a phenomenon in which certain materials can conduct electricity with zero resistance when they are cooled below a certain temperature, called the critical temperature. This allows for the creation of extremely efficient electrical systems and devices.

2. What is the relationship between superconductivity and magnetism?

Superconductivity and magnetism are closely related, as they both involve the movement of electrons. In superconductors, the electrons move without resistance, while in magnets, the electrons align to create a magnetic field. When combined, superconductivity and magnetism can lead to unique properties, such as the Meissner effect, where a magnet placed near a superconductor will be repelled.

3. What are the different types of superconductors?

There are two main types of superconductors: conventional and unconventional. Conventional superconductors are materials that can only achieve superconductivity at extremely low temperatures, usually below 30K. Unconventional superconductors, on the other hand, can achieve superconductivity at higher temperatures, up to 138K.

4. How is superconductivity used in real-world applications?

Superconductivity has a variety of real-world applications, such as in MRI machines, particle accelerators, and power transmission lines. It is also being researched for use in quantum computing, high-speed trains, and more efficient energy storage systems.

5. What are the challenges facing the widespread use of superconductivity?

One of the main challenges facing the widespread use of superconductivity is the need for extremely low temperatures to achieve superconductivity. This requires expensive cooling systems and limits the practicality of using superconductors in everyday devices. Additionally, the cost of producing superconducting materials is still high, making it difficult to implement on a large scale. Research is ongoing to find ways to overcome these challenges and make superconductivity more accessible.

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