Abstract
In this study, we focused on temperature and current distributions in voltage-state large-size intrinsic Josephson junction (IJJ) mesas with a self-heating effect. Because it is difficult to experimentally obtain temperature and current distributions in IJJ mesas, we numerically computed these distributions by solving non-linear diffusion and temperature dependence circuit equations. The local temperature in the mesa exceeded the critical temperature, and a normal-state appeared in the high bias region. Non-uniform temperature and current density distributions were obtained for each bias point of the current–voltage (I–V) characteristics. Normalized c-axis current distributions decreased with an increase in the bias current in the high bias regions. These results were explained using temperature dependent c-axis resistivity.
Highlights
The recent development of electronic devices using Josephson junctions is expected
We numerically investigated temperature and current distribution in large-size intrinsic Josephson junction (IJJ) mesas by solving non-linear diffusion and temperature dependence circuit equations
The local temperature exceeded the critical temperature, and a normal-state appeared in the mesa in the high bias region
Summary
The recent development of electronic devices using Josephson junctions is expected. Because Josephson junctions can operate at a higher speed and are more sensitive than semiconductors, they are expected to be used in future device applications. A terahertz electromagnetic wave emitter using the ac Josephson effect in large-size mesa-type Bi2212 IJJs has been intensively studied.. The self-heating effect of IJJ devices has been studied using various methods. It is known that in small-size IJJ mesas, self-heating is small and temperature distribution in the mesa is nearly uniform.. In large-size IJJ mesas, the self-heating effect is considerably larger and temperatures in the mesa are non-uniformly distributed. A. Yurgens has numerically investigated temperature distributions and I–V characteristics in IJJ mesas.. In previous studies, temperature and current distributions in large-size IJJ mesas were not discussed in detail. We focused on temperature and current distributions in voltage-state large-size IJJ mesas with a self-heating effect. Scitation.org/journal/adv and current distributions in IJJ mesas, we numerically computed these distributions by solving non-linear diffusion and temperature dependence circuit equations
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