Universal spectral signatures in pnictides and cuprates: the role of quasiparticle-pair coupling

Mauger, A.; Noat, Yves

doi:10.1088/1361-648x/aa884a

Cited by 3 publications

(3 citation statements)

References 98 publications

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“…However in our case, the i-index represents pairons of differing binding energies and the Hamiltonian (4) represents a non-superconducting state of independent Cooper pairs. In order to establish a macroscopic coherent state, a coupling between pairs of different energies is necessary [28][29][30]. Without the interaction term between pairons, no long range order is possible.…”

Section: And Using the Standard Bcs Expressionmentioning

confidence: 99%

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Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations

Mauger¹,

Noat²

2018

J. Phys.: Condens. Matter

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ARPES mesurements in cuprates have given key information on the temperature and angle dependence of the gap (d-wave order parameter, Fermi arcs and pseudogap). We show that these features can be understood in terms of a Bose condensation of interacting pairons (preformed hole pairs which form in their local antiferromagnetic environment). Starting from the basic properties of the pairon wavefunction, we derive the corresponding k-space spectral function. The latter explains the variation of the ARPES spectra as a function of temperature and angle up to T * , the onset temperature of pairon formation. While Bose excitations dominate at the antinode, the fermion excitations dominate around the nodal direction, giving rise to the Fermi arcs at finite temperature. This dual role is the key feature distinguishing cuprate from conventional superconductivity.

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Section: And Using the Standard Bcs Expressionmentioning

confidence: 99%

“…In the absence of pairon-pairon interactions, the system is in an incoherent state, the 'Cooper glass' [28][29][30]. The pairon energies are distributed with a pair density of states P 0 (∆ i ), characterized by the mean value ∆ 0 and dispersion σ 0 .…”

Section: And Using the Standard Bcs Expressionmentioning

confidence: 99%

Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations

Mauger¹,

Noat²

2018

J. Phys.: Condens. Matter

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“…The resulting PG-like DOS is plotted in figure 11 (dashed line) and compared to the experimental one found in the vortex core (inset of figure 11) obtained by Pan et al [70]. The quasiparticle DOS in the SC state is more involved to calculate and was given full treatments in [64,74,75]. Indeed, in the coherent state, the self-consistent d-wave gap function was shown to be :…”

Section: Quasiparticle Dosmentioning

confidence: 87%

Statistics of the cuprate pairon states on a square lattice

Noat,

Mauger,

Sacks

2023

Modelling Simul. Mater. Sci. Eng.

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In this paper the fundamental parameters of high-$T_c$superconductivity are shown to be connected to the statistics ofpairons on a square lattice. In particular, we study the densityfluctuations and the distribution of Voronoi cell areas surroundingeach pairon on the scale of the antiferromagnetic correlationlength, for the complete range of pairon concentration. We show thatthe key parameters of the phase diagram, the $T_c$ dome, and thepseudogap temperature $T^*$, emerge from the statistical propertiesof the pairon disordered state. In this approach, thesuperconducting and the pseudogap states appear as inseparablephenomena. The condensation energy, which fixes the criticaltemperature, is directly proportional to the {\it correlationenergy} between pairons and {\it not} to the energy gap, contrary toconventional superconductors.When the correlation energy between pairons is suppressed byfluctuations, either thermally, by disorder, or in the vortex core,the pseudogap state of disordered pairons is obtained. We attributethe unique features of cuprate superconductivity to thisorder-disorder transition in real space, which clearly differs fromthe BCS mechanism. Our predictions are in quantitative agreementwith low-temperature tunneling and photoemission spectroscopyexperiments.

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

Noat

Mauger

Nohara

et al. 2021

Solid State Communications

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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.

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Universal spectral signatures in pnictides and cuprates: the role of quasiparticle-pair coupling

Cited by 3 publications

References 98 publications

Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations

Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations

Statistics of the cuprate pairon states on a square lattice

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

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