VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6

› 9:30 - 10:00 (30min)
Exotic life of Cooper pairs in normal metal
Mikko Mottonen  1@  , Joonas Govenius  1@  , Russell Lake  1@  , Ville Pietilä  1@  , Pauli Virtanen  2@  , Tero Heikkila  2@  
1 : QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University  (Aalto)  -  Website
POB 13500 FI-00076 AALTO -  Finland
2 : Low Temperature Laboratory (OVLL), Aalto University  (LTL Aalto)
POB 14100 FI-00076 AALTO -  Finland

Conventional superconductivity is understood by the formation and condensation of Cooper pairs that compose of electrons with opposite spin and linear momentum degrees of freedom. The strength of these pair correlations is typically a material-dependent parameter. However, when a natural superconductor is in a galvanic contact with a natural normal metal, the pair correlations can penetrate into the normal metal up to substantial lengths, a phenomenon referred to as the proximity effect. We give a brief review on the studies carried out in the past decades on the proximity effect in metallic systems and present our latest experimental results on very low-volume samples with the aim at using them as thermometers and power sensors of different types at temperatures well below 100 mK. In addition, we touch on the subject of the dependence of the pair correlation strength on the normal-metal length in the limit of low diffusion constants.

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