Theory of surface impedance resonances in superconductors
Thesis/Dissertation
·
OSTI ID:7019080
Structure appears in the microwave surface impedance of bulk, superconducting metals, such as Al, In, Pb, and Sn, in the presence of an applied, weak static magnetic field. In the case of normal metals at low temperature, similar structure has been quite successfully interpreted in terms of radiative transitions between magnetically induced surface states. The states correspond to quasiparticles localized to a small region of the Fermi surface and bound to the highly polished, planar sample surface. However, a quantitative theory with respect to the superconductors has been lacking even though the original data are of vernerable age (18 years). This thesis establishes such a detailed theory in the framework of the linear response of the system to the applied radiation field. The spatial behavior of the applied static magnetic field is described explicitly via an effective potential. In the case of a Type I superconductor (such as Al), the nonlocal nature of the electromagnetic response of a superconductor has been taken into account. The surface quasiparticle energy spectrum is found by solving the equations of motion (the Bogolyubov equations).
- Research Organization:
- Dartmouth Coll., Hanover, NH (USA)
- OSTI ID:
- 7019080
- Country of Publication:
- United States
- Language:
- English
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