Journal
SCIENCE
Volume 326, Issue 5950, Pages 272-275Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1178139
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Funding
- NSF [0706380, 0653377]
- Deutsche-Israelische Projektkooperation
- Sloan Foundation
- UNESCO-L'Oreal
- U. S. Department of Energy [DE-FG02-08ER46482]
- U.S. Department of Energy (DOE) [DE-FG02-08ER46482] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0653377] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0706380] Funding Source: National Science Foundation
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Quantum mechanics predicts that the equilibrium state of a resistive metal ring will contain a dissipationless current. This persistent current has been the focus of considerable theoretical and experimental work, but its basic properties remain a topic of controversy. The main experimental challenges in studying persistent currents have been the small signals they produce and their exceptional sensitivity to their environment. We have developed a technique for detecting persistent currents that allows us to measure the persistent current in metal rings over a wide range of temperatures, ring sizes, and magnetic fields. Measurements of both a single ring and arrays of rings agree well with calculations based on a model of non-interacting electrons.
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