Evidence on the pseudogap and condensate from the electronic specific heat

Loram, J. W.; Luo, Jason; Cooper, J. R.; Liang, W. Y.; Tallon, J. L.

doi:10.1016/s0022-3697(00)00101-3

Cited by 261 publications

(442 citation statements)

References 13 publications

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“…This is in qualitative disagreement with photoemission experiments on underdoped cuprate superconductors which show a near absence of a quasiparticle peak near the (π, 0) point in the Brillouin zone [10]. This depletion of quasiparticle states, or pseudogap, is also seen in thermodynamic measurements [11]. The phenomenon may not be specific to the underdoped cuprates.…”

Section: Introductioncontrasting

confidence: 63%

Migdal’s theorem and the pseudogap

Monthoux¹

2003

Phys. Rev. B

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We study a model of quasiparticles on a two-dimensional square lattice coupled to Gaussian distributed dynamical molecular fields. We consider two types of such fields, a vector molecular field that couples to the quasiparticle spin-density and a scalar field coupled to the quasiparticle number density. An important feature of the magnetic pseudogap found in the present calculations is that it is strongly anisotropic. It vanishes along the diagonal of the Brillouin zone and is large near the zone boundary. In the case of ferromagnetic fluctuations, we also find a range of model parameters with qualitative changes in the quasiparticle spectral function not captured by the one-loop approximation, in that the quasiparticle peak splits into two. We find that one needs to be closer to the magnetic boundary to observe the pseudogap effects in the nearly ferromagnetic case relative to the nearly antiferromagnetic one, under otherwise similar conditions. We provide intuitive arguments to explain the physical origin of the breakdown of Migdal's theorem.

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Section: Introductioncontrasting

confidence: 63%

Migdal’s theorem and the pseudogap

Monthoux¹

2003

Phys. Rev. B

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“…As T rises, θ 0 decreases resulting in a 'filling-in' of the PG and the growth of the Fermi arcs. The PG is a nonstates-conserving gap [18] i.e. unlike the SC gap there is no pile up of states outside the gap.…”

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confidence: 99%

“…2(d). (4) or (5) and compared with the experimental data for Bi-2212 [18] where every 20th data point is shown.…”

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confidence: 99%

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Fermi arcs in cuprate superconductors: Tracking the pseudogap belowTcand aboveT*

et al. 2007

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“…In such systems, understanding the interplay between the superconductivity and the pseudogap regime could be the key to clarify the mechanisms behind the unconventional superconductivity. Experimental results for some cuprates indicate a close relation among specific heat, condensation energy and the pseudogap 4,5,6,7 . More precisely, due to the presence of a pseudogap on the normal state density of states, the jump in the specific heat and the superconducting condensation energy decrease below a given doping.…”

Section: Introductionmentioning

confidence: 84%

Interplay Between Condensation Energy, Pseudogap, and the Specific Heat of a Hubbard Model in a $$n$$ n -Pole Approximation

Lausmann¹,

Calegari²,

Magalhães³

et al. 2014

J Low Temp Phys

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The condensation energy and the specific heat jump of a two-dimensional Hubbard model, suitable to discuss high-T c superconductors, is studied. In this work, the Hubbard model is investigated by the Green's function method within a n-pole approximation, which allows to consider superconductivity with d x 2 −y 2 -wave pairing. In the present scenario, the pseudogap regime emerges when the antiferromagnetic (AF) correlations become sufficiently strong to move to lower energies the region around of the nodal point (π, π) on the renormalized bands. It is observed that above a given total occupation n T , the specific heat jump ∆C and also the condensation energy U(0) decrease signaling the presence of the pseudogap.

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Evidence on the pseudogap and condensate from the electronic specific heat

Cited by 261 publications

References 13 publications

Migdal’s theorem and the pseudogap

Migdal’s theorem and the pseudogap

Fermi arcs in cuprate superconductors: Tracking the pseudogap belowTcand aboveT*

Interplay Between Condensation Energy, Pseudogap, and the Specific Heat of a Hubbard Model in a $$n$$ n -Pole Approximation

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