Physics – Condensed Matter – Superconductivity
Scientific paper
2005-10-05
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.95.197003
The kinetic energy of superconducting electrons in an ultrathin, doubly connected superconducting cylinder, determined by the applied flux, increases as the cylinder diameter decreases, leading to a destructive regime around half-flux quanta and a superconductor to normal metal quantum phase transition (QPT). Regular step-like features in resistance vs. temperature curves taken at fixed flux values were observed near the QPT in ultrathin Al cylinders. It is proposed that these features are most likely resulted from a phase separation near the QPT in which normal regions nucleate in a homogeneous superconducting cylinder.
Carrigan P. T.
Kurz Nathan A.
Liu Ya-Ying
Rock B. Y.
Rosario M. M.
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