Topology effects on the heat capacity of mesoscopic superconducting disks

Abstract

Phase transitions in superconducting mesoscopic disks have been studied over the H-T phase diagram through heat capacity measurement of an array of independent aluminium disks. These disks exhibit non periodic modulations versus H of the height of the heat capacity jump at the superconducting to normal transition. This behaviour is attributed to giant vortex states characterized by their vorticity L. A crossover from a bulk-like to a mesoscopic behaviour is demonstrated. $C_{\mathrm{p}}$ versus H plots exhibit cascades of phase transitions as L increases or decreases by one unity, with a strong hysteresis. Phase diagrams of giant vortex states inside the superconducting region are drawn in the vortex penetration and expulsion regimes and phase transitions driven by temperature between vortex states are thus predicted in the zero field cooled regime before being experimentally evidenced.

References in corpus (8)

• Vortex phase diagram for mesoscopic superconducting disks
• Experimental Evidence for Giant Vortex States in a Mesoscopic Superconducting Disk
• Attojoule calorimetry of mesoscopic superconducting loops
• Critical Fields of mesoscopic superconductors
• Hysteresis in mesoscopic superconducting disks: the Bean-Livingston barrier
• Multiple flux jumps and irreversible behavior of thin Al superconducting rings
• Thermal signatures of Little-Parks effect in the heat capacity of mesoscopic superconducting rings
• Heat Capacity of Mesoscopic Superconducting Disks

Cited by in corpus (6)

• Niobium nitride thin films for very low temperature resistive thermometry
• Phase-Dependent Electronic Specific Heat in Mesoscopic Josephson Junctions
• Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3$\omega$-V$\ddot{o}$lklein method
• In-situ comprehensive calibration of a tri-port nano-electro-mechanical device
• Influence of interface transmissivity and inelastic scattering on the electronic entropy and specific heat of diffusive SNS Josephson junctions
• Searching for thermal signatures of persistent currents in normal metal rings