The Magnetocaloric Effect in Mesoscopic Type-I Superconducting Needles

Zevallos G D.B.; Dominguez A.B.; Orna T D.A.; De Los Santos Valladares L.; Dória M.M.; de Oliveira I.G. · Journal of Superconductivity and Novel Magnetism (2026) · DOI: 10.1007/s10948-025-07104-5

Resumen

In this paper we report our calculations regarding the heat absorbed by type-I superconducting needles with cross-sections of different geometric shapes, all having the same area. We used standard London theory to calculate the magnetic field inside these needles, allowing us to examine the magnetocaloric effect produced when the needles are subjected to a magnetic field difference. The cross-section geometries studied here include circular, square, triangular, heptagonal, hexagonal and ellipsoidal shapes. We also studied how small cylinders of different superconductors placed inside these needles influence the magnetocaloric effect of the overall system. Our main finding reveals a hierarchy in the ability to absorb heat based on the geometry of the straight cross-section. Notably, we discovered that there exists a temperature where above it, this hierarchy is inverted. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

Instituciones: Universidad Nacional Mayor de San Marcos