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Condensed Matter Seminars

ics Condensed Matter
Thursday, November 7, 2002
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Prof. Ying Lu [Host: Y. Yoon]
Penn State
"Destructive regime and superconductor-normal metal transition in ultrathin cylinders"
We have carried out experiments on ultrathin superconducting cylinders, which revealed the existence of a destructive regime, the loss of superconductivity around half-integer flux quanta even in the zero temperature limit, predicted by de Gennes for doubly connected samples with a diameter smaller than zero-temperature superconducting coherence length [Y. Liu, et al., Science 294, 2332 (2001)]. More recently we have done measurements on the superconductor-normal metal (S-N) transition tuned by magnetic flux in these cylinders, and found evidence for the formation of normal bands near the S-N transition.

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