Unconventional temperature dependence of the cuprate excitation spectrum

William Sacks, Alain Mauger and Yves Noat ()
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William Sacks: Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Universités
Alain Mauger: Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Universités
Yves Noat: Institut des Nanosciences de Paris (INSP), UMR 7588, Sorbonne Universités

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 8, 1-6

Abstract: Abstract Key properties of the cuprates, such as the pseudogap observed above the critical temperature T c , remain highly debated. Given their importance, we recently proposed a novel mechanism based on the Bose-like condensation of mutually interacting Cooper pairs [W. Sacks, A. Mauger, Y. Noat, Supercond. Sci. Technol. 28, 105014 (2015)]. In this work, we calculate the temperature dependent DOS using this model for different doping levels from underdoped to overdoped. In all situations, due to the presence of excited pairs, a pseudogap is found above T c while the normal DOS is recovered at T ∗, the pair formation temperature. A similar behavior is found as a function of magnetic field, crossing a vortex, where a pseudogap exists in the vortex core. We show that the precise DOS shape depends on combined pair (boson) and quasiparticle (fermion) excitations, allowing for a deeper understanding of the SC to the PG transition.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70268-2

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