On the self-consistent theory of Josephson effect in ballistic superconducting microconstrictions

Автор(и)

  • M. Zareyan Institute for Advanced Studies in Basic Sciences, 45195-159, Gava Zang, Zanjan, Iran
  • Yu. A. Kolesnichenko B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 310164 Kharkov, Ukraine
  • A. N. Omelyanchouk B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 310164 Kharkov, Ukraine

DOI:

https://doi.org/10.1063/1.593831

Ключові слова:

PACS: 73.23.-b, 74.50. v

Анотація

The microscopic theory of current-carrying states in the ballistic superconducting microchannel is presented. The effects of the contact length L on the Josephson current are investigated. For the temperatures T close to the critical temperature Tc the problem is treated self-consistently, with allowance for the distribution of the order parameter D(r) inside the contact. The closed integral equation for D in strongly inhomogeneous microcontact geometry (L&lt and ~x0 , where x0 is the coherence length at T=0) replaces the differential Ginzburg-Landau equation. The critical current Ic(L) is expressed in terms of the solution of this integral equation. The limiting cases of L&lt&ltx0 and L>>x0 are considered. With increasing length L, the critical current decreases, although the ballistic Sharvin resistance of the contact remains the same as at L=0. For ultrashort channels with L&lt and ~ aD (aD~nF/wD , where w D is the Debye frequency) the corrections for the value of the critical current Ic(L=0) are sensitive to the strong-coupling effects.

Завантаження

Дані завантаження ще не доступні.

Downloads

Опубліковано

1999-11-10

Як цитувати

(1)
Zareyan, M.; Kolesnichenko, Y. A.; Omelyanchouk, A. N. On the Self-Consistent Theory of Josephson Effect in Ballistic Superconducting Microconstrictions. Fiz. Nizk. Temp. 1999, 25, 1154-1160.

Номер

Розділ

Надпровідність, зокрема високотемпературна

Статті цього автора (авторів), які найбільше читають

<< < 1 2 3 4 5 6 > >>