Fluctuation effects in high sheet resistance superconducting films

J.M. Valles^a, J.A. Chervenak^a, Hsu S.-Y.^b, T. Kouh^a
^aBrown University, Providence, Rhode Island, USA
^bNational Chiao Tung University, Ta Hsueh Road, 300 Hsinchu, 1001, Taiwan , Hsinchu , Taiwan

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.

PACS: 71.30.+h, 73.23.Hk, 74.50.+r, 74.76.-w (all)
DOI: 10.1070/1063-7869/44/10S/S23
URL: https://ufn.ru/en/articles/2001/13/w/
Citation: Valles J M, Chervenak J A, Hsu S.-Y., Kouh T "Fluctuation effects in high sheet resistance superconducting films" Phys. Usp. 44 104–108 (2001)

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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 Physics-Uspekhi
PY 2001
JO Physics-Uspekhi
JF Physics-Uspekhi
JA Phys. Usp.
VL 44
IS 13
SP 104-108
UR https://ufn.ru/en/articles/2001/13/w/
ER https://doi.org/10.1070/1063-7869/44/10S/S23

Оригинал: Valles J M, Chervenak J A, Hsu S.-Y., Kouh T «Fluctuation effects in high sheet resistance superconducting films» УФН 171 104–108 (2001); DOI: 10.1070/1063-7869/44/10S/S23