Comparison of energy and phase relaxation in metallic wires |
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Authors: | A B Gougam F Pierre H Pothier D Esteve and Norman O Birge |
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Affiliation: | (1) Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1116, USA;(2) Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique, Saclay, F-91191 Gif-sur-Yvette, France |
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Abstract: | We have determined the phase coherence time, ![tau](/content/k17tx1x35307p075/xxlarge964.gif) , frommagnetoresistance measurements of long, narrow wires ofAu, Ag, and Cu, over the temperature range40 mK-6 K. In the Cu and Au wires, ![tau](/content/k17tx1x35307p075/xxlarge964.gif) saturates at low temperature. In the Ag wire,![tau](/content/k17tx1x35307p075/xxlarge964.gif) continues to increase down to the lowesttemperatures measured; moreover, its temperature dependencebelow about 1 K is consistent with theoreticalpredictions of Altshuler, Aronov and Khmelnitskii published in1982. These results cast doubt on recent assertions thatsaturation of ![tau](/content/k17tx1x35307p075/xxlarge964.gif) at low temperature is a universalphenomenon in metal wires. We compare these results with thoseof recent experiments on energy relaxation in similar metallicwires. The results of the two experiments are stronglycorrelated, suggesting that a single (unknown) mechanism isthe cause of the enhanced phase and energy relaxation observedin some samples. |
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