Phys. Rev. B 61, 9793–9799 (2000)ac response of Hg-based superconductors: Surface barrier and bulk pinning contributionsReceived 29 November 1999; published in the issue dated 1 April 2000 A complete study of the ac response of Hg-based superconductors with 1, 2, and 3 Cu-O planes is presented. Under a dc field, the ac susceptibility χac(T) displays a double transition, which is argued to be of intrinsic nature. The systematic analysis of the evolution of χac (fundamental and higher harmonics) as a function of the experimental parameters, and the comparison with resistance and dc magnetization measurements, suggest that the higher temperature transition is ascribed to magnetic irreversibility due to surface barriers; the lower temperature transition is associated to bulk pinning. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.9793
DOI:
10.1103/PhysRevB.61.9793
PACS:
74.72.Gr, 74.25.Ha, 74.60.Ge
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