Pseudogap in Doped Mott Insulators is the Near-Neighbor Analogue of the Mott Gap

Stãnescu, Tudor D.; Phillips, Philip

doi:10.1103/physrevlett.91.017002

Cited by 38 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, T * (δ → 0) does decrease by a factor of 2 between U = 18 and U = 36. In other words, T * (δ → 0) scales with J [65, 66,91] for large values of U , confirming short-range correlations due to superexchange as the origin of the pseudogap. Furthermore, the order of magnitude of T * (δ → 0) at U = 9 agrees with the experimental values reported in Refs.…”

mentioning

confidence: 78%

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Reymbaut

Bergeron

Garioud

et al. 2019

Phys. Rev. Research

View full text Add to dashboard Cite

The first indication of a pseudogap in cuprates came from a sudden decrease of NMR Knight shift at a doping-dependent temperature T * (δ). Since then, experiments have found phase transitions at a lower T * phase (δ). Using plaquette cellular dynamical mean-field for the square-lattice Hubbard model at high temperature, where the results are reliable, we show that T * (δ) shares many features of T * phase (δ). The remarkable agreement with several experiments, including quantum critical behavior of the electronic specific heat, supports the view that the pseudogap is controlled by a finite-doping extension of the Mott transition. We propose further experimental tests. PACS numbers: 71.30.+h, 74.25.Dw, 71.10.Fd Below a doping-dependent temperature T * , early studies of cuprate high temperature superconductors found a decrease in NMR Knight shift [1-5]. This freezing of uniform spin fluctuations, a thermodynamic quantity, became the first signature of what is widely referred to as the pseudogap, one of the remaining challenges for theory. With time, another definition of the pseudogap became more popular. Polarized neutron diffraction [6-8], Nernst effect measurements [9], ultrasound measurements [10], terahertz polarimetry [11] and optical anisotropy measurements [12] report that the prototypical YBa 2 Cu 3 O y undergoes a thermodynamic phase transition that breaks time-reversal, spatial inversion, twofold rotational, four-fold rotational and mirror symmetries below a doping-dependent temperature T * phase that is distinctly lower than T * at low doping. This suggests that phase transitions are a consequence of the pseudogap first observed in NMR, not the cause [13,14].In this paper, we address the nature of the pseudogap that was first found in NMR. We focus mostly on thermodynamic signatures at high temperature, where cluster generalizations of dynamical mean-field theory provide a reliable theoretical tool. The remarkable agreement that we find with several experiments supports the view that the high-temperature physics of the pseudogap is controlled by a finite-doping extension of the Mott transition that includes superexchange effects [15]. We propose further experimental tests to investigate that hypothesis.

show abstract

mentioning

confidence: 78%

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Reymbaut

Bergeron

Garioud

et al. 2019

Phys. Rev. Research

View full text Add to dashboard Cite

show abstract

“…9,10 Mechanisms attributing the origin of the pseudogap to a direct consequence of the proximity to the Mott insulator have also been proposed. [11][12][13][14][15] Among the theoretical efforts, recent development of the dynamical mean-field theory ͑DMFT͒ ͑Ref. 16͒ and its cluster extensions 17,18 has enabled studies on dynamics of microscopic models without any ad hoc approximation.…”

Section: Introductionmentioning

confidence: 99%

Doped high-Tccuprate superconductors elucidated in the light of zeros and poles of the electronic Green’s function

2010

View full text Add to dashboard Cite

We study electronic structure of hole-and electron-doped Mott insulators in the two-dimensional Hubbard model to reach a unified picture for the normal state of cuprate high-T c superconductors. By using a cluster extension of the dynamical mean-field theory, we demonstrate that structure of coexisting zeros and poles of the single-particle Green's function holds the key to understand Mott physics in the underdoped region. We show evidence for the emergence of non-Fermi-liquid phase caused by the topological quantum phase transition of Fermi surface by analyzing low-energy charge dynamics. The spectra calculated in a wide range of energy and momentum reproduce various anomalous properties observed in experiments for the high-T c cuprates. Our results reveal that the pseudogap in hole-doped cuprates has a d-wavelike structure only below the Fermi level while it retains non-d-wave structure with a fully opened gap above the Fermi energy even in the nodal direction due to a zero surface extending over the entire Brillouin zone. In addition to the non-d-wave pseudogap, the present comprehensive identifications of the spectral asymmetry as to the Fermi energy, the Fermi arc, and the back-bending behavior of the dispersion, waterfall, and low-energy kink, in agreement with the experimental anomalies of the cuprates, do not support that these originate from ͑the precursors of͒ symmetry breakings such as the preformed pairing and the d-density-wave fluctuations, but support that they are direct consequences of the proximity to the Mott insulator. Several possible experiments are further proposed to prove or disprove our zero mechanism.

show abstract

“…Although there are several theoretical proposals for the PG origin, for example the resonating valence bond [8], magnetic correlation [2], SC [9][10][11] correlation, Mott gap [12], nematic order [13], etc, clear consensus has not yet been reached among researchers. One of the main obstacles to the experimental study of the PG phenomena is that the competing correlations-as listed above-in the UCSs often have similar energy scales so that it is naturally difficult to distinguish the responsible correlation from others.…”

Section: Introductionmentioning

confidence: 99%

“…The low-energy PG has been almost proven to originate from the SC fluctuations [9][10][11]. As to the high-energy PG, there is still a lack of a complete consensus [1,2,8,12,13], and it is also possible that different UCSs may have different origins for their own PG.…”

Section: Introductionmentioning

confidence: 99%

Evidence of a pseudogap for superconducting iron-pnictide Ba_0.6+δK_0.4−δFe₂As₂single crystals from optical conductivity measurements

Kwon¹,

Hong²,

Jang³

et al. 2012

New J. Phys.

View full text Add to dashboard Cite

We report the observation of pseudogap (PG) behavior in optical conductivity in an underdoped Ba 0.6+δ K 0.4−δ Fe 2 As 2 (T onset c ≈ 36 K) single crystal far above T c , up to 100 K (≈ 3T c ). Wide separation of the energy scales of the magnetic and superconducting (SC) correlations in the Ba 0.6+δ K 0.4−δ Fe 2 As 2 sample enabled us to establish that the PG structures observed in optical conductivity in the range of 50-150 cm −1 are uniquely driven by the SC correlation, and the magnetic correlation coexists in the far separated range of about 700 cm −1 . Theoretical calculations, based on the preformed Cooper pair model, provided an excellent description of the temperature evolution of the SC correlation in optical conductivity data from below to above T c .

show abstract

Pseudogap in Doped Mott Insulators is the Near-Neighbor Analogue of the Mott Gap

Cited by 38 publications

References 23 publications

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Doped high-Tccuprate superconductors elucidated in the light of zeros and poles of the electronic Green’s function

Evidence of a pseudogap for superconducting iron-pnictide Ba_0.6+δK_0.4−δFe₂As₂single crystals from optical conductivity measurements

Contact Info

Product

Resources

About

Pseudogap in Doped Mott Insulators is the Near-Neighbor Analogue of the Mott Gap

Cited by 38 publications

References 23 publications

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators

Doped high-Tccuprate superconductors elucidated in the light of zeros and poles of the electronic Green’s function

Evidence of a pseudogap for superconducting iron-pnictide Ba0.6+δK0.4−δFe2As2single crystals from optical conductivity measurements

Contact Info

Product

Resources

About

Evidence of a pseudogap for superconducting iron-pnictide Ba_0.6+δK_0.4−δFe₂As₂single crystals from optical conductivity measurements