Characteristics of Superconducting Point Contacts in a Sphereical Cavity |
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A.H. Dayem APPLIED CURRENT approximately arrows BCS GAP bias voltage biased biconal antenna cavity walls circuit coated conductance peak constant voltage Cooper pairs copper piston copper sphere corresponding critical current region cryostat current peaks current source current step Delrin dewar differential resistance peaks dv/dI characteristics dv/di curves DV/DI OHMS electrical energy gap equation etching solution experiment experimental runs feedback Figure frequency gap of niobium gauge-invariant geometry hysteresis I-V and dv/dI I-V characteristics I-V curve indium Josephson current Josephson effect Josephson junction Josephson radiation Letters lever-arm lock-in lock-in amplifier measured mode models narrow-band resonant noted observed odd series ohm resistor optical path length phase Phys Physics point-contact protoporphyrin Puma ramp range from 4.2 resistor resonant cavity Riedel single particle tunneling spanned spherical cavity structure appeared subharmonic super superconducting superconducting energy temperature dependence temperature range theory University of Virginia voltage bias VOLTAGE MV Werthamer X-Y recorder