Absolute magnetic penetration depth of thin‐film niobium measured by fluxoid quantization

摘要: The absolute magnetic penetration depth of a superconducting niobium film is measured using fluxoid quantization. Laser pulses drive part thin, planar loop normal, changing its quantum state. We determine the total inductance by measuring coupling to interference device at various temperatures. fit temperature dependence data Bardeen–Cooper–Schrieffer (BCS) theory and kinetic inductances. directly related through geometry loop, agrees well with BCS theory.