As the normal-state sheet resistance, $R_n$, of a thinfilm superconductor increases, its superconducting properties degrade. For $R_n\simeq h/4e^2$ superconductivity disappears and a transition to a nonsuperconducting state occurs. We present electron tunneling and transport measurements on ultrathin, homogeneously disordered superconducting films in the vicinity of this transition. The data provide strong evidence that fluctuations in the amplitude of the superconducting order parameter dominate the tunneling density of states and the resistive transitions in this regime. We briefly discuss possible sources of these amplitude fluctuation effects. We also describe how the data suggest a novel picture of the superconductor-tononsuperconductor transition in homogeneous $\mathrm{2D}$ systems.

TY JOUR
TI Fluctuation effects in high sheet resistance superconducting films
AU Valles, J. M.
AU Chervenak, J. A.
AU Hsu S.-Y.
AU Kouh, T.
PB Успехи физических наук
PY 2001
JO Успехи физических наук
JF Успехи физических наук
JA Усп. физ. наук
VL 171
IS 13
SP 104-108
UR https://ufn.ru/ru/articles/2001/13/w/
ER https://doi.org/10.1070/1063-7869/44/10S/S23