Linking the pseudogap in the cuprates with local symmetry breaking: A commentary

Kivelson, Steven; Lederer, Samuel

doi:10.1073/pnas.1908786116

Cited by 29 publications

(18 citation statements)

References 31 publications

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“…Yet, any theory for the CDW in Y-or Bi-based cuprates has to be reconciled with the prevailing fact that ARPES experiments fail to identify signatures of spectral changes or electronic reconstruction in the charge ordered phase. Even, in charge-stripe ordered Nd-doped LSCO, the interpretation of lineshape changes remains subtle 64,65 . For these reasons, the anticipated CDW can be considered weak.…”

Section: Resultsmentioning

confidence: 99%

Emergent charge order from correlated electron-phonon physics in cuprates

2020

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Charge-density wave order is now understood to be a widespread feature of underdoped cuprate high-temperature superconductors, although its origins remain unclear. While experiments suggest that the charge-ordering wavevector is determined by Fermi-surface nesting, the relevant sections of the Fermi surface are featureless and provide no clue as to the underlying mechanism. Here, focusing on underdoped YBa2Cu3O6+x, we propose that charge-density waves form from the incipient softening of a bond-buckling phonon. The momentum dependence of its coupling to itinerant electrons favourably selects the wavevector found in experiments. But, it requires quasiparticle renormalization by strong electronic correlations to enable a unique enhancement of the charge susceptibility near the B1g-phonon selected wavevector. The B1g phonon frequency softens by a few percent, and finite-range charge-density wave correlations will form locally, if nucleated by defects or dopant disorder. These results suggest that underdoped cuprates cannot be understood in the context of strong electronic correlations alone.

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Section: Resultsmentioning

confidence: 99%

Emergent charge order from correlated electron-phonon physics in cuprates

2020

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“…It should also be stressed that Pr +3 atoms have an intrinsic magnetic moment of μ Pr ≈ 3.58μ B 21 , which is m eff ≈ 2μ B in the PrBCO compound 22 . That is why the study of the effect of Pr impurity on the properties of YPrBaCuO single crystals is considered very promising for revealing the mechanisms of the interplay of the superconductivity and magnetism in HTSC, (for example 23,24 and references given therein), which is important for the final clarification of the physical nature of both the PG and high-temperature superconductivity in general 1,2,5–7,10,11 .…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of pseudogap in Y0.95Pr0.05Ba2Cu3O7−δ single crystals under pressure up to 1.7 GPa

Solovjov

Omelchenko

Petrenko

et al. 2019

Sci Rep

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The effect of hydrostatic pressure up to P = 1.7 GPa on the fluctuation conductivity σ′(T) and pseudogap ∆*(T) in Y0.95Pr0.05Ba2Cu3O7−δ single crystal with critical temperature Тс = 85.2 K (at P = 0) was investigated. The application of pressure leads to the increase in Tc with dTc/dP = +1.82 K∙GPa−1 while the resistance decreases as dlnρ(100 K)/dP = −(10.5 ± 0.2) %∙GPa−1. Regardless of the pressure, in the temperature interval from Tc to T0 (~88 K at P = 0) the behaviour of σ′(T) is well described by the Aslamazov – Larkin (AL – 3D) fluctuation theory, and above the T0 by the Lawrence – Doniach theory (LD). The Maki-Thompson (MT – 2D) fluctuation contribution is not observed. This indicates the presence of structural defects in the sample induced by Pr. Here it is determined for the first time that when the pressure is applied to the Y1−xPrxBa2Cu3O7−δ single crystal, the pseudogap increases as dlnΔ*/dP = 0.17 GPa–1.

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“…Таким образом, природа и свойства псевдощелевой фазы T -купратов с дырочным допированием могут быть связаны с формированием и эволюцией неоднородной системы EH-димеров, ориентированных вдоль направления связей Cu-O-Cu, что, кстати, будет сопровождаться спонтанным нарушением тетрагональной симметрии с признаками нематического порядка (nematic order) [29,30]. Именно EH-димеры являются " прародителями" сверхпроводящей фазы и волн зарядовой плотности (CDW).…”

Section: сценарий формирования псевдощелевой фазы купратов с дырочнымunclassified

“…скрывает" истинное квантовое основное состояние типа RVB-состояния Андерсона, образуемого квантовыми EH-димерами (псевдоспиновая жидкость). Как и для квантового s = 1/2 антиферромагнетика, реально наблюдаемое " физическое" основное состояние отличается как от истинного квантового синглетного основного состояния типа псевдоспиновой жидкости, так и от MFA-состояний, в частности, сильной редукцией величины локальных параметров порядка как для CDW-фазы, так и для сверхпроводящей dBS-фазы [29,40,41]. MFA-фазы представляют "…”

Section: модель зарядовых триплетов и S = 1 псевдо-спиновый формализмunclassified

Природа Псевдощелевой Фазы ВТСП Купратов

Москвин¹,

Панов²

2020

Физика Твердого Тела

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The pseudogap phase of HTSC cuprates is associated with the formation of a system of quantum electron-hole (EH) dimers similar to the Anderson RVB-phase. We considered the specific role of electron-lattice relaxation in the formation of metastable EH dimers in cuprates with T- and T′-structures. In the model of charge triplets and S = 1 pseudospin formalism, the effective spin-pseudospin Hamiltonian of the cuprate CuO2 plane is introduced. In the framework of the molecular field approximation (MFA) for the coordinate representation, the main MFA phases were found: an antiferromagnetic insulator, a charge density wave, a bosonic superconductor with d-symmetry of the order parameter, and two metal Fermi-phases forming the phase of the "strange" metal. We argue that the MFA can correctly reproduce all the features of the typical cuprate phase diagrams. As for typical s = 1/2 quantum antiferromagnet the actually observed cuprate phases such as charge order and superconductivity reflect "physical" ground state, which is close to MFA-phases but with strongly reduced magnitudes of the local order parameters.

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Linking the pseudogap in the cuprates with local symmetry breaking: A commentary

Cited by 29 publications

References 31 publications

Emergent charge order from correlated electron-phonon physics in cuprates

Emergent charge order from correlated electron-phonon physics in cuprates

Peculiarities of pseudogap in Y0.95Pr0.05Ba2Cu3O7−δ single crystals under pressure up to 1.7 GPa

Природа Псевдощелевой Фазы ВТСП Купратов

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