Hamburg 2001 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Josephsonkontakte und SQUIDs, Supraleitung: Theorie, Korrelierte Elektronen, Niederdimensionale Systeme, Magnetotransport, Quantenhalleffekt, Kohlenstoff-Nanoröhrchen, Quantenflüssigkeiten

TT 6.5: Poster

Montag, 26. März 2001, 14:30–17:00, Rang S\ 3

Experiments with triangular arrays: tuning of resonances by tirm current^∗ — •A.A. Abdumalikov¹, P. Caputo², S. Yukon³, and A.V. Ustinov³ — ¹Physikalisches Institut III, Friedrich-Alexander-Universitä t Erlangen-Nürnberg — ²Universita’ degli Studi di Salerno Dipartimento di Fisica Via. S. Allende, I-84081 Baronissi, Italy — ³Air Force Research Laboratory, SNHE Hanscom AFB, MA 01731-5000

We have experimentally investigated triangular arrays of Josephson junctions in a perpendicular magnetic field. According to the theoretical predictions [1], by breaking symmetry of the array from cell to cell it is to possible to enlarge the operating margins of the array and to increase flatness of the phases profile. Yukon and Lin [1] proposed to do that by adding trim currents at the edges of the array. These currents are expected to stabilize coherent oscillations and emited radiation power. These statements are true if the polarities of the bias and trim currents are opposite. Otherwise, the operation margins and emitting radiation power are expected to decrease. Experimental data obtained to date confirm the theoretical predictions. We observed that by trimming the bias current one can change the height and shape of the both resonance steps.

[1] S.P. Yukon and N.C.H. Lin, Maximizing microwave power from triangular Josephson junction arrays, IEEE Trans. Appl. Supercond., 9, No.2, pp.4320-4324 (1999)
^∗ Supported by European Office of Aerospace Research and Development (EOARD)