Magnetic moment of a slab of type-I superconductor: Theoretical model and experiment

Article

关键词: FIELDS;    STATE;   

DOI  :  10.1103/PhysRevB.90.104519

来源: SCIE

【 摘 要 】

The magnetic moment M of superconducting samples with a nonzero demagnetizing factor is one of the most important but not always completely understood sample characteristics. Here we calculate the magnetic moment of a slab of type-I superconductor in an arbitrarily oriented magnetic field, applying a recently developed model of the intermediate state (IS) [V. Kozhevnikov et al., Phys. Rev. B 89, 100503(R) (2014)]. We introduce and employ a novel form of the thermodynamic potential, which allows us to derive a general formula for the total free energy of the slab. The magnetic moment, calculated from the total free energy, is consistent with experimental data reported in this paper as well as with data available in the literature. Also, the calculated moment solves a long-standing puzzle of experimental M(H) curves (H is the applied field) and provides insight in the field driven evolution of the magnetic flux density in the domain structure of the IS. This paper completes our presentation of a theoretical model which consistently addresses all properties of the IS, thus solving the problem of the IS in a slab that was put forward by Landau almost eight decades ago.

【 授权许可】

Free