Benseman, T. M., Koshelev, A. E., Kwok, W-K., Welp, U., Kadowaki, K., Cooper, J. R. and Balakrishnan, G. (2013) The ac Josephson relation and inhomogeneous temperature distributions in large Bi2Sr2CaCu2O8+δmesas for THz emission. Superconductor Science and Technology, Volume 26 (Number 8). Article number 085016. doi:10.1088/0953-2048/26/8/085016

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Abstract

We have studied the terahertz emission from a 720 × 60 × 1.2 μm3 mesa patterned from under-doped Bi2Sr2CaCu2O8+δ. This device has an S-shaped current–voltage characteristic due to self-heating, allowing us to compare its THz emission behaviours at up to three different bias currents for the same voltage. The THz frequency generated along the lowest current branch follows the expected Josephson relation for a stack of intrinsic Josephson junctions connected in series. However, in the high current regimes, THz emission occurs at a significantly lower frequency than expected. We show that this behaviour is consistent with strongly non-uniform self-heating of the mesa at high bias currents.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Superconductor Science and Technology
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	0953-2048
Official Date:	August 2013
Dates:	Date Event August 2013 Published
Volume:	Volume 26
Number:	Number 8
Page Range:	Article number 085016
DOI:	10.1088/0953-2048/26/8/085016
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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