Thermal signatures of the Little-Parks effect in the heat capacity of mesoscopic superconducting rings
Florian R. Ong, Olivier Bourgeois, Sergey E. Skipetrov, Jacques Chaussy
DOI 10.1103/PhysRevB.74.140503 · Physical Review B
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Abstract
We present measurements of thermal signatures of the Little-Parks effect using a highly sensitive nanocalorimeter. Small variations of the heat capacity Cp of 2.5 millions of noninteracting micrometer-sized superconducting rings threaded by a magnetic flux Φ have been measured by attojoule calorimetry. This noninvasive method allows the measurement of thermodynamic properties—and hence the probing of the energy levels—of nanosystems without perturbing them electrically. It is observed that Cp is strongly influenced by the fluxoid quantization (Little-Parks effect) near the critical temperature Tc. The jump of Cp at the superconducting phase transition is an oscillating function of Φ with a period Φ0=h∕2e, the magnetic flux quantum, which is in agreement with the Ginzburg-Landau theory of superconductivity.
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. | 1.46 | Pressure not reported | onset |
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