Attojoule Calorimetry of Mesoscopic Superconducting Loops
O. Bourgeois, S. E. Skipetrov, F. Ong, J. Chaussy
DOI 10.1103/PhysRevLett.94.057007 · Physical Review Letters
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Abstract
We report the first experimental evidence of nontrivial thermal behavior of the simplest mesoscopic system—a superconducting loop. By measuring the specific heat C of an array of 450 000 noninteracting aluminum loops with very high accuracy of ∼20 fJ/K, we show that the loops go through a periodic sequence of phase transitions (with a period of an integer number of magnetic flux quanta) as the magnetic flux threading each loop is increased. The transitions are well described by the Ginzburg-Landau theory and are accompanied by discontinuities of C of only several thousands of Boltzmann constants kB.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | unknown |
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