How ‘pairons’ are revealed in the electronic specific heat of cuprates

Yves Noat, Alain Mauger, Minoru Nohara, Hiroshi Eisaki, William Sacks

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Understanding the thermodynamic properties of high-Tc cuprate superconductors is a key step to establish a satisfactory theory of these materials. The electronic specific heat is highly unconventional, distinctly non-BCS, with remarkable doping-dependent features extending well beyond Tc. The pairon concept, bound holes in their local antiferromagnetic environment, has successfully described the tunneling and photoemission spectra. In this article, we show that the model explains the distinctive features of the entropy and specific heat throughout the temperature-doping phase diagram. Their interpretation connects unambiguously the pseudogap, existing up to T*, to the superconducting state below Tc. In the underdoped case, the specific heat is dominated by pairon excitations, following Bose statistics, while with increasing doping, both bosonic excitations and fermionic quasiparticles coexist.

    Original languageEnglish
    Article number114109
    JournalSolid State Communications
    Volume323
    DOIs
    Publication statusPublished - Jan 2021

    Keywords

    • Cuprates superconductors
    • Electronic specific heat
    • High-temperature superconductors
    • Pseudogap

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

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