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19 April 2024

» pubmed » pmid11290004

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Magnetic field dependence of the superconducting gap and the pseudogap in Bi2212 and HgBr2-Bi2212, studied by intrinsic tunneling spectroscopy
V M Krasnov ; A E Kovalev ; A Yurgens ; D Winkler ;
Date:	19 Mar 2001
Journal:	Phys Rev Lett, 86 (12), 2657-60
Abstract:	Intrinsic tunneling spectroscopy in high magnetic field (H) is used for a direct test of superconducting features in the quasiparticle density of states of pure Bi2212 and intercalated HgBr2-Bi2212 high- T(c) superconductors. We were able to distinguish with great clarity two coexisting gaps: (i) the superconducting gap, which closes as H-->H(c2)(T), and (ii) the c-axis pseudogap, which does not change either with H or with T. Strikingly different H dependencies, together with previously observed different temperature dependencies of the two gaps, speak against a superconducting origin of the pseudogap.
Source:	PubMed, pmid11290004
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