Comment on 'Magnetic levitation force and penetration depth in type-II superconductors'

A. Badía

doi:10.1103/PhysRevB.55.11875

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Comment on 'Magnetic levitation force and penetration depth in type-II superconductors'

A. Badía

DOI 10.1103/PhysRevB.55.11875 · Physical Review B

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Abstract

A new approach for examining the various superconducting pairing states was proposed by Xu, Miller, and Ting [Phys. Rev. B 51, 424 (1995)]. The method consists of investigating the levitation force measured by a magnetic force microscope tip above a superconducting sample. Nevertheless, the quantitative analysis of experimental results needs to take into account important geometrical effects. In this Comment I show that, related to several physical arguments, the geometrical coefficients given by the authors admit much more simple expressions, allowing straightforward calculations for practical purposes. Furthermore, the method is presented for extending their linear theory to higher-order approximations.