343 citations · 928 across the 27 of their papers we have counts for
4 papers · 1 filter
Microwave response of vortices in superconducting thin films of Re and Al
C. Song, T. W. Heitmann, M. P. DeFeo +5
Vortices in superconductors driven at microwave frequencies exhibit a response related to the interplay between the vortex viscosity, pinning strength, and flux creep effects. At t…
Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel
T. W. Heitmann, K. Yu, C. Song +4
We have developed a picovoltmeter using a Nb dc Superconducting QUantum Interference Device (SQUID) for measuring the flux-flow voltage from a small number of vortices moving throu…
Asymmetric weak-pinning superconducting channels: vortex ratchets
K. Yu, T. W. Heitmann, C. Song +4
The controlled motion of objects through narrow channels is important in many fields. We have fabricated asymmetric weak-pinning channels in a superconducting thin-film strip for c…
MgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy
T. W. Heitmann, S. D. Bu, D. M. Kim +13
We report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature depen…