Unconventional temperature dependence of the cuprate excitation spectrum

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, Superconduct. 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 $T^{\ast }$, 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.

arXiv commentAccepted in the European Physical Journal B (EPJB)

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Cited by in corpus (7)

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• Cuprates phase diagram deduced from magnetic susceptibility: what is the `true' pseudogap line?
• Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations
• How 'pairons' are revealed in the electronic specific heat of cuprates
• From Cooper-pair glass to unconventional superconductivity: a unified approach to cuprates and pnictides
• Unraveling pairon excitations and the antiferromagnetic contributions in the cuprate specific heat
• Condensation mechanism of high-$T_c$ cuprates: the key role of pairon excitations