We consider the current-phase relation (CPR) in the Josephson junctions with complex insulatorsuperconductor-ferromagnetic interlayers in the vicinity of 0-π transition. We find a strong impact of the second harmonic on CPR of the junctions. It is shown that the critical current can be kept constant in the region of 0-pi transition, while the CPR transforms through multi-valued hysteretic states depending on the relative values of tunnel transparency and magnetic thickness. Moreover, CPR in the transition region has multiple branches with distinct ground states.

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An LaF 3 layer was shown to improve the characteristics of field-effect gas sensors for room-temperature hydrogen monitoring. The Pt/LaF 3 interface leads to a Nernst-type response and a detection limit of 10-ppm hydrogen in atmospheric air. The response time was shown to be about 110 s and was independent of hydrogen concentration. A method for the stabilization of a long-term behavior of the sensor was successfully demonstrated. The mechanism of the sensor's response to hydrogen was shown to be different from that of the metal/insulator/semiconductor (MIS)-type sensors.Index Terms-Hydrogen sensor, metal/insulator/semiconductor (MIS) structure, room-temperature measurement, solid electrolyte.

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