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Modeling the power flow in normal conductor-insulator-superconductor junctions

Jochum, J. and Mears, C. and Golwala, S. and Sadoulet, B. and Castle, J. P. and Cunningham, M. F. and Drury, O. B. and Frank, M. and Labov, S. E. and Lipschultz, F. P. and Netel, H. and Neuhauser, B. (1998) Modeling the power flow in normal conductor-insulator-superconductor junctions. Journal of Applied Physics, 83 (6). pp. 3217-3224. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:JOCjap98

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Abstract

Normal conductor-insulator-superconductor (NIS) junctions promise to be interesting for x-ray and phonon sensing applications, in particular due to the expected self-cooling of the N electrode by the tunneling current. Such cooling would enable the operation of the active element of the sensor below the cryostat temperature and at a correspondingly higher sensitivity. It would also allow the use of MS junctions as microcoolers. At present, this cooling has not been realized in large area junctions (suitable for a number of detector applications). In this article, we discuss a detailed modeling of the heat flow in such junctions; we show how the heat flow into the normal electrode by quasiparticle back-tunneling and phonon absorption from quasiparticle pair recombination can overcompensate the cooling power. This provides a microscopic explanation of the self-heating effects we observe in our large area NIS junctions. The model suggests a number of possible solutions.


Item Type:Article
Additional Information:©1998 American Institute of Physics. Received 27 October 1997; accepted 26 November 1997. This work was supported in part by the Center for Particle Astrophysics, an NSF Science and Technology Center, under Cooperative Agreement AST-912005, and by IGPPLLNL Grant No. AP96-41. J. Jochum is partly supported by a Feodor-Lynen Fellowship of the Alexander von Humboldt Foundation.
Subject Keywords:SUPERCONDUCTING JUNCTIONS; SIMULATION; MONTE CARLO METHOD; POWER; COOLING; HEAT FLUX; RADIATION DETECTION
Record Number:CaltechAUTHORS:JOCjap98
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:JOCjap98
Alternative URL:http://dx.doi.org/10.1063/1.367121
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3022
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 May 2006
Last Modified:26 Dec 2012 08:52

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