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024 7 _ |2 DOI
|a 10.1103/PhysRevLett.109.107002
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024 7 _ |2 Handle
|a 2128/7586
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082 _ _ |a 550
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|a Physics, Multidisciplinary
100 1 _ |0 P:(DE-HGF)0
|a Sickinger, H.
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245 _ _ |a Experimental evidence of a phi-Josephson Junction
260 _ _ |a College Park, Md.
|b APS
|c 2012
300 _ _ |a 107002
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440 _ 0 |0 4925
|a Physical Review Letters
|v 109
|x 0031-9007
|y 10
500 _ _ |3 POF3_Assignment on 2016-02-29
500 _ _ |a We acknowledge financial support by the German Israeli Foundation (Grant No. G-967-126.14/2007) and DFG (via SFB/TRR-21, project A5 as well via project Go-1106/3). H. S. gratefully acknowledges support by the Evangelisches Studienwerk e. V. Villigst.
520 _ _ |a We demonstrate experimentally the existence of Josephson junctions having a doubly degenerate ground state with an average Josephson phase psi = +/-phi. The value of phi can be chosen by design in the interval 0 < phi < pi. The junctions used in our experiments are fabricated as 0-pi Josephson junctions of moderate normalized length with asymmetric 0 and pi regions. We show that (a) these phi Josephson junctions have two critical currents, corresponding to the escape of the phase c from -phi and +phi states, (b) the phase psi can be set to a particular state by tuning an external magnetic field, or (c) by using a proper bias current sweep sequence. The experimental observations are in agreement with previous theoretical predictions.
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856 7 _ |u http://dx.doi.org/10.1103/PhysRevLett.109.107002
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