VERWEY TRANSITION (VT) BY PSEUDO-JOSEPHSON JUNCTIONS

摘要

We investigated pseudo-Josephson current effects in magnetite. Compared with the orig_inal Josephson junctions applied to superconductors, we obtained theoretical results that correlate well with experimental current data. Even though we applied a pseudo_ Josephson junction to the current along the axis of energy (i.e. the momentum space), the theoretical form of DC-type currents was proportional to a tan function for the time parameter or a tanh function for the temperature parameter, which agrees with the experimental data. These pseudo-Josephson junctions occur in momentum space rather than in real space. The currents in magnetite are not primarily due to the electron_phonon interactions that induce a gap opening in band structures. We hypothesize that the Verwey Transition (VT) mechanism is pseudo-Josephson in nature.