https://www.intechopen.com/chapters/68271




https://www.intechopen.com/chapters/68271

Superconductivity and MicrowavesSuperconductivity conforms to a quantum, thermal, and electrodynamic set of physical phenomena of great interest by themselves. They have, also, the potential to be one clean energy source that technology is looking for. Superconductors do not allow static magnetic fields to penetrate them below a critical field, that is, Meissner effect. However, microwave magnetic fields do penetrate them already, and their energy is readily absorbed by the superconductor. High-temperature, perovskite superconductors do absorb microwave energy the most due to the presence of unpaired electron spins, fluxoid dynamics, and quasiparticle motion. We describe the fundamental physics of the interaction of the superconductors with microwaves. Experimental techniques to measure microwave absorption are presented. Experimental setups for absorption of energy are described in terms of the central quantity, Q. The measurements are analyzed in terms of irreversible energy exchange processes. The knowledge gained can inform the design of superconducting devices operating in microwave environments.www.intechopen.com


Superconductivity conforms to a quantum, thermal, and electrodynamic set of physical phenomena of great interest by themselves. They have, also, the potential to be one clean energy source that technology is looking for. Superconductors do not allow static magnetic fields to penetrate them below a critical field, that is, Meissner effect. However, microwave magnetic fields do penetrate them already, and their energy is readily absorbed by the superconductor. High-temperature, perovskite superconductors do absorb microwave energy the most due to the presence of unpaired electron spins, fluxoid dynamics, and quasiparticle motion. We describe the fundamental physics of the interaction of the superconductors with microwaves. Experimental techniques to measure microwave absorption are presented. Experimental setups for absorption of energy are described in terms of the central quantity, Q. The measurements are analyzed in terms of irreversible energy exchange processes. The knowledge gained can inform the design of superconducting devices operating in microwave environments.



초전도체는 정전기 자기장이 임계장 아래로 침투하지 못하게 하며, 즉 마이스너 효과입니다. 그러나 마이크로파 자기장은 이미 그것들을 관통하고, 그들의 에너지는 초전도체에 의해 쉽게 흡수됩니다.


다른 자기장이랑 다르게, 마이크로파는 초전도체가 잘 흡수하나봐
근데 일반 물질도 잘 흡수하지 않나?

Hence, coexistence of both normal and SC states is allowed in the mixed state. Inside these fluxoids, ξ, there are no Cooper pairs, but only normal electrons that if moved, they will do it in the normal way, ?n, dissipating energy because inside the vortices, the medium is normal-viscous for the motion of the electrons. If alternating electromagnetic fields are applied to such superconductor in the mixed state, the Lorentz force on the normal electrons will force them into periodic damped motion; in addition, the inside of these vortices will radiate since it contains electric charges in accelerated motion [16, 31]. If microwaves are applied, again, the electrons are subjected to a Lorentz force that will make the normal electrons to move with friction and would be accelerated and radiate microwaves. This result was established more than 70 years ago [7, 8].




추가로 이런 내용도 있음. superconductor가 혼합상태일때(혼합상태란게 뭔지 정확힐 모르겠음. 비 초전도상 물질과 초전도체가 섞였단건가?) 마이크로파를 쏘면 무슨 힘이 적용되어서 마이크로파를 방출한대.