Ultra low temperature facility - Universität Bayreuth

• Research unit: EU RFP
• Project number: 97.0409

Key words (English)

Mesoscopic effects; proximity; superconductivity

Alternative project number (English)

EU project number: ERBFMGECT950072

Research programs (English)

EU-programme: 4. Frame Research Programme - 10.1 Stimulation of training and mobility

Short description (English)

See abstract

Partners and International Organizations (English)

Coordinator: University Bayreuth (D)

Abstract (English)

In this project we investigated the magnetic response of mesoscopic cylinders of a normal metal, Cu, Ag, and Au, in proximity with superconducting niobium in the tempertature range 100 pk>T>9K.
By covering five decades in temperature, we were able to extract the correct temperature dependence of the reentrant induced diamagnetism in these proximity structeres. Over a large mesoscopic regime, the exponential temperature dependence og the paramagnetic susceptibilitzy has the fingerprint of several levels of quantum coherence along integer multiples n = 1, 2, 4 of the cylinder perimeter L. The origin of this puzzoling paramagnetism in mesoscopic NS cylinders is still an open question.

References in databases (English)

Swiss Database: Euro-DB of the
State Secretariat for Education and Research
Hallwylstrasse 4
CH-3003 Berne, Switzerland
Tel. [phone]
Swiss Project-Number: 97.0409