Thermal expansion of Josephson junctions as an elastic response to an effective stress field

Details Thermal expansion of Josephson junctions as an elastic response to an effective stress field Thermal expansion of Josephson junctions as an elastic response to an effective stress field

2007-01-18

arxiv.org/abs/cond-mat/0701459v1

Phys. Rev. B 75, 014506 (2007)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.75.014506

By introducing a concept of thermal expansion (TE) of a Josephson junction as an elastic response to an effective stress field, we study (both analytically and numerically) the temperature and magnetic field dependence of TE coefficient $\alpha $ in a single small junction and in a square array. In particular, we found that in addition to {\it field} oscillations due to Fraunhofer-like dependence of the critical current, $\alpha $ of a small single junction also exhibits strong flux driven {\it temperature} oscillations near $T_C$. We also numerically simulated stress induced response of a closed loop with finite self-inductance (a prototype of an array) and found that $\alpha $ of a $5\times 5$ array may still exhibit temperature oscillations provided the applied magnetic field is strong enough to compensate for the screening induced effects.

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