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Unconventional temperature dependence of the cuprate excitation spectrum

Author

Listed:
  • 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)

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.

Suggested Citation

  • William Sacks & Alain Mauger & Yves Noat, 2016. "Unconventional temperature dependence of the cuprate excitation spectrum," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 89(8), pages 1-6, August.
    • Handle: RePEc:spr:eurphb:v:89:y:2016:i:8:d:10.1140_epjb_e2016-70268-2
    DOI: 10.1140/epjb/e2016-70268-2
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    Solid State and Materials;

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