Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction

Details Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction

2001-02-22

arxiv.org/abs/cond-mat/0102404v3

Phys. Rev. Lett. 86, 5369 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, a reference added

Scientific paper

10.1103/PhysRevLett.86.5369

We have measured the current-phase relationship (CPR) of symmetric 45 degree YBaCuO grain boundary Josephson junctions. Substantial deviations of the CPR from conventional tunnel-junction behavior have been observed: (i) The critical current exhibits, as a function of temperature T, a local minimum at a temperature T*. (ii) At T approximately equal to T*, the first harmonic of the CPR changes sign. (iii) For T

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