Physics – Condensed Matter – Superconductivity
Scientific paper
2006-09-21
Physics
Condensed Matter
Superconductivity
To be published in Physical Review B, Rapid Communications
Scientific paper
10.1103/PhysRevB.74.140503
We present the first measurements of thermal signatures of the Little-Parks effect using a highly sensitive nanocalorimeter. Small variations of the heat capacity $C\_p$ of 2.5 millions of non interacting micrometer-sized superconducting rings threaded by a magnetic flux $\Phi$ have been measured by attojoule calorimetry. This non-invasive 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 $C\_p$ is strongly influenced by the fluxoid quantization (Little-Parks effect) near the critical temperature $T\_c$. The jump of $C\_p$ at the superconducting phase transition is an oscillating function of $\Phi$ with a period $\Phi\_0=h/2e$, the magnetic flux quantum, which is in agreement with the Ginzburg-Landau theory of superconductivity.
Bourgeois Olivier
Chaussy Jacques
Ong Florian R.
Skipetrov Sergey E.
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