Phase diagram of geometric d-wave superconductor Josephson junctions
A. Gumann, N. Schopohl
DOI 10.1103/PhysRevB.79.144505 · Physical Review B
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Abstract
We show that a constriction-type Josephson junction realized by an epitactic thin film of a d-wave superconductor with an appropriate boundary geometry exhibits intrinsic phase differences between 0 and π depending on geometric parameters and temperature. Based on microscopic Eilenberger theory, we provide a general derivation of the relation between the change in the free energy of the junction and the current-phase relation. From the change in the free energy, we calculate phase diagrams and discuss transitions driven by geometric parameters and temperature.
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