Abstract
The nonlinear normal state diamagnetism reported by Li et al (2010 Phys. Rev. B 81 054510)is shown to be incompatible with a claimed Cooper pairing and vortex liquidabove the resistive critical temperature. However, it is perfectly compatible withthe normal state Landau diamagnetism of real-space composed bosons, whichprovides a description of the nonlinear magnetization curves of the less anisotropiccuprates La–Sr–Cu–O (LSCO) and Y–Ba–Cu–O (YBCO) as well as for stronglyanisotropic bismuth-based cuprates over the whole range of available magnetic fields.
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