Pseudogap in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">YBa</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>i

Cooper, J. R.; Loram, J. W.; Kokanović, Ivan; Storey, J. G.; Tallon, J. L.

doi:10.1103/physrevb.89.201104

Cited by 17 publications

(32 citation statements)

References 37 publications

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“…The dome-shaped doping dependence of the SC transition temperature T c also follows naturally. Moreover, the model is consistent with optical conductivity, tunneling and photoemission spectroscopy data, and with the presence of unconventional broken-symmetry phenomena observed below the PG temperature T * [7][8][9][10][11][12][13][14]51]. Finally, the model identifies the main characteristics of the SC glue, which must be associated with the same local correlations that localize the one hole per planar CuO 2 unit discerned in the present work.…”

Section: Discussionsupporting

confidence: 87%

“…In this picture, T * signifies a percolation transition. At a qualitative level, this is consistent with the evidence for a phase transition, including from polarized neutron diffraction [7,8], polar Kerr effect [9], optical [12], ultrasound [10], thermoelectric [11], and magnetic torque [13,14] experiments, and with the concomitant absence of a significant specific heat anomaly [51]. Such a phase transition would be a secondary, emergent phenomenon [52].…”

Section: Fermi Surface and Intrinsic Inhomogeneitysupporting

confidence: 84%

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Evidence for a universal Fermi-liquid scattering rate throughout the phase diagram of the copper-oxide superconductors

et al. 2019

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The phase diagram of the cuprate superconductors continues to pose formidable scientific challenges. While these materials are typically viewed as doped Mott insulators, it is well known that they are Fermi liquids at high hole-dopant concentrations. It was recently demonstrated that at moderate doping, in the pseudogap (PG) region of the phase diagram, the charge carriers are also best described as a Fermi liquid. Nevertheless, the relationship between the two Fermi-liquid (FL) regions and the nature of the strange-metal (SM) state at intermediate doping have remained unsolved. Here we show for the case of the model cuprate superconductor HgBa 2 CuO 4+δ that the normal-state transport scattering rate determined from the cotangent of the Hall angle remains quadratic in temperature across the PG temperature, upon entering the SM state, and that it is doping-independent below optimal doping. Analysis of prior transport results for other cuprates reveals that this behavior is universal throughout the entire phase diagram and points to a pervasive FL transport scattering rate. These observations can be reconciled with a variety of other experimental results for the cuprates upon considering the possibility that the PG phenomenon is associated with the gradual, non-uniform localization of one hole per planar CuO 2 unit.

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Section: Discussionsupporting

confidence: 87%

Section: Fermi Surface and Intrinsic Inhomogeneitysupporting

confidence: 84%

Evidence for a universal Fermi-liquid scattering rate throughout the phase diagram of the copper-oxide superconductors

et al. 2019

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“…[10]. Second, the difference in the lattice specific heat between two near doping values is in general small, and allows us to safely use the x = 7 PDOS from ARPES for other dopings, such as x = 6.80.…”

Section: A Lattice Specific Heatmentioning

confidence: 99%

“…The phase diagram [9] of the YBa 2 Cu 3 O x shows a dome in the superconducting temperature as a function of the oxygen content x, either by introducing electrons or holes, giving the latter ones the higher temperatures. Cooper pairs are pre-formed at a particular temperature T * > T c (pseudogap temperature) above the superconducting dome in the underdoped region [9,10] (where T c is smaller than the higher T c possible), and they undergo a Bose-Einstein Condensation (BEC) as temperature is lowered [11,12]. There are many other characteristics, but of special interest to us are some recently reported experimental results: the modification of the size of the lattice with oxygen doping [13]; the notorious increase of the superconducting gap magnitude [14] and the dramatic drop of the Fermi temperature T F when doping is diminished [15].…”

Section: Introductionmentioning

confidence: 99%

Specific heat of underdoped cuprate superconductors from a phenomenological layered Boson–Fermion model

Salas

Fortes

Solís

et al. 2016

Physica C: Superconductivity and its Applications

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We adapt the Boson-Fermion superconductivity model to include layered systems such as underdoped cuprate superconductors. These systems are represented by an infinite layered structure containing a mixture of paired and unpaired fermions. The former, which stand for the superconducting carriers, are considered as noninteracting zero spin composite-bosons with a linear energymomentum dispersion relation in the CuO2 planes where superconduction is predominant, coexisting with the unpaired fermions in a pattern of stacked slabs. The inter-slab, penetrable, infinite planes are generated by a Dirac comb potential, while paired and unpaired electrons (or holes) are free to move parallel to the planes. Composite-bosons condense at a critical temperature at which they exhibit a jump in their specific heat. These two values are assumed to be equal to the superconducting critical temperature Tc and the specific heat jump reported for YBa2Cu3O6.80 to fix our model parameters namely, the plane impenetrability and the fraction of superconducting charge carriers. We then calculate the isochoric and isobaric electronic specific heats for temperatures lower than Tc of both, the composite-bosons and the unpaired fermions, which matches recent experimental curves. From the latter, we extract the linear coefficient (γn) at Tc, as well as the quadratic (αT 2 ) term for low temperatures. We also calculate the lattice specific heat from the ARPES phonon spectrum, and add it to the electronic part, reproducing the experimental total specific heat at and below Tc within a 5% error range, from which the cubic (ßT 3 ) term for low temperatures is obtained. In addition, we show that this model reproduces the cuprates mass anisotropies.

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“…59,60 However, there is experimental evidence for a true thermodynamic phase transition 61,62 at T * (although this has been challenged in Ref. 63) that terminates at a quantum critical point near p = 0.19.…”

mentioning

confidence: 99%

Emergence of charge order in a staggered loop-current phase of cuprate high-temperature superconductors

2016

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We study the emergence of charge ordered phases within a π-loop current (πLC) model for the pseudogap based on a three-band model for underdoped cuprate superconductors. Loop currents and charge ordering are driven by distinct components of the short-range Coulomb interactions: loop currents result from the repulsion between nearest-neighbor copper and oxygen orbitals, while charge order results from repulsion between neighboring oxygen orbitals. We find that the leading πLC phase has an antiferromagnetic pattern similar to previously discovered staggered flux phases, and that it emerges abruptly at hole dopings p below the van Hove filling. Subsequent charge ordering tendencies in the πLC phase reveal that diagonal d-charge density waves (dCDW) are suppressed by the loop currents while axial order competes more weakly. In some cases we find a wide temperature range below the loop-current transition, over which the susceptibility towards an axial dCDW is large. In these cases, short-range axial charge order may be induced by dopingrelated disorder. A unique feature of the coexisting dCDW and πLC phases is the emergence of an incommensurate modulation of the loop currents. If the dCDW is biaxial (checkerboard) then the resulting incommensurate current pattern breaks all mirror and time-reversal symmetries, thereby allowing for a polar Kerr effect.

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Pseudogap inYBa2Cu3O6+δi

Cited by 17 publications

References 37 publications

Evidence for a universal Fermi-liquid scattering rate throughout the phase diagram of the copper-oxide superconductors

Evidence for a universal Fermi-liquid scattering rate throughout the phase diagram of the copper-oxide superconductors

Specific heat of underdoped cuprate superconductors from a phenomenological layered Boson–Fermion model

Emergence of charge order in a staggered loop-current phase of cuprate high-temperature superconductors

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