Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions

Autor:	Y. Shen, Ke Chen, J. M. Rowell, Alan W Kleinsasser, Daniel Cunnane, Xiaoxing Xi
Rok vydání:	2012
Předmět:	Josephson effect Pi Josephson junction Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Josephson current Electrode Chemical vapor deposition Current (fluid) Type-II superconductor Andreev reflection
Zdroj:	Applied Physics Letters. 100:122601
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.3695159
Popis:	The current-voltage and conductance-voltage characteristics of MgB2/MgO/MgB2 junctions made with MgB2 electrodes grown by hybrid physical-chemical vapor deposition were systematically analyzed. In the junctions with different sizes and critical current densities, we found excess current and subharmonic gap structure indicative of multiple Andreev reflection. An apparent link between multiple Andreev reflection and substantial Josephson current at high temperatures suggests that the barrier is dominated by high-transparency channels.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2bd847289236810728826e1fd389be3e https://doi.org/10.1063/1.3695159 Zobrazit plný text záznamu