Multiple Andreev reflection and giant excess noise in diffusive superconductor/normal-metal/superconductor junctions

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urn:nbn:de:bvb:355-epub-80945 Copy

Hoss, Tilman ; Strunk, Christoph ; Nussbaumer, Thomas ; Huber, R. ; Staufer, U. ; Schonenberger, Christian

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Date of publication of this fulltext: 05 Aug 2009 13:58

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Details

Item type:	Article
Journal or Publication Title:	Physical Review B (PRB)
Publisher:	American Physical Society
Volume:	62
Number of Issue or Book Chapter:	6
Page Range:	p. 4079
Date:	1 August 2000
Institutions:	Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk
Identification Number:	Value Type 10.1103/PhysRevB.62.4079 DOI
Classification:	Notation Type 74.40.+k PACS 73.23.-b PACS 74.25.Fy PACS 74.80.Fp PACS
Keywords:	ENHANCED SHOT-NOISE; QUANTUM POINT CONTACTS; ENERGY-GAP STRUCTURE; JOSEPHSON-JUNCTIONS; METAL; TRANSPORT; SUPERCURRENT; WIRES
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Partially
Item ID:	8094

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Abstract

We have studied superconductor/normal-metal/superconductor (SNS) junctions consisting of shea Au or Cu wires between Nh or Al banks. The Nb based junctions display inherent electron heating effects induced by the high thermal resistance of the NS boundaries. The Al based junctions show in addition subharmonic gap structures in the differential conductance dI/dV and a pronounced peak in the excess ...

Abstract

We have studied superconductor/normal-metal/superconductor (SNS) junctions consisting of shea Au or Cu wires between Nh or Al banks. The Nb based junctions display inherent electron heating effects induced by the high thermal resistance of the NS boundaries. The Al based junctions show in addition subharmonic gap structures in the differential conductance dI/dV and a pronounced peak in the excess noise at very low voltages V. We suggest that the noise peak is caused by fluctuations of the supercurrent at the onset of Josephson coupling between the superconducting banks. At intermediate temperatures where the supercurrent is suppressed a noise contribution proportional to 1/V remains, which suggests the presence of a long-range proximity effect in the noise.

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Metadata last modified: 04 Jun 2018 08:59

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