Phase periodic thermopower in normal metal/superconductor nanostructures

✍ Scribed by A Parsons; I Sosnin; V.T Petrashov

• Book ID: 104428640
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 119 KB
• Volume: 18
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)01060-3

✦ Synopsis

The phase-periodic thermopower in di usive Sb/Al nanostructures (Andreev interferometers) has been measured in the temperature range 0:3 ¡ T ¡ 1:5 K. Thermoelectric voltage arising between two normal probes was compared to that between normal and superconducting probe. In both cases, the maximum amplitude of oscillations was of the same order of magnitude and was reached at heating currents corresponding to the temperature of superconducting transition, where dR=dT also has its maximum, R is the resistance of Sb wire. Remarkably, at low heating currents the two show drastically di erent behavior, indicating that there are probably two di erent mechanisms for thermopower in these structures.