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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
Monday, March 26, 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)