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Santander-Syro, A. F.; Lobo, R. P. S. M.; Bontemps, N.; Lopera, W.; Giratá, D.; Konstantinović, Z.; Li, Z. Z.; Raffy, H.

doi:10.1103/physrevb.70.134504

Cited by 59 publications

(84 citation statements)

References 53 publications

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“…This claim is supported by the qualitative agreement with the critical concentrations of crossover observed in the transport experiments 5,6 and in the optical experiment [7][8][9] , and even quantitative agreement of the doping dependence of the nodal Fermi velocity and of the effective mass [11][12][13] . Although we use a simple mean-field theory, though strong-coupled, the agreement with the experiments is not surprising since we included all necessary for High-T c copper oxides ingredients.…”

Section: Discussion and Summarysupporting

confidence: 72%

Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-Tc copper oxides

Korshunov

Овчинников

2007

Eur. Phys. J. B

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In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p-and n-type High-Tc cuprates is developed. This theory applied to the effective t − t ′ − t ′′ − J * model with the ab initio calculated parameters and with the three-site correlated hoppings. The static spin-spin and kinematic correlation functions beyond Hubbard-I approximation are calculated self-consistently. The evolution of the Fermi surface and band dispersion is obtained for the wide range of doping concentrations x. For p-type systems the three different types of behavior are found and the transitions between these types are accompanied by the changes in the Fermi surface topology. Thus a quantum phase transitions take place at x = 0.15 and at x = 0.23. Due to the different Fermi surface topology we found for n-type cuprates only one quantum critical concentration, x = 0.2. The calculated doping dependence of the nodal Fermi velocity and the effective mass are in good agreement with the experimental data.

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Section: Discussion and Summarysupporting

confidence: 72%

Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-Tc copper oxides

Korshunov

Овчинников

2007

Eur. Phys. J. B

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“…All these parameters may freely vary with temperature. This approach has been successfully utilized in several cuprate thin films and a detailed analysis can be found in Santander-Syro et al 60 However, the use of Eq. A2 is model dependent.…”

Section: Acknowledgementsmentioning

confidence: 99%

Optical study of superconductingPr2CuOxwithx≃4

et al. 2014

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Superconducting Pr2CuOx, x ≃ 4 (PCO) films with T ′ structure and a Tc of 27 K have been investigated by various optical methods in a wide frequency (7 -55000 cm −1 ) and temperature (2 to 300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300 cm −1 persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6 µm, indicating a rather low density of the superconducting condensate.

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“…Then, below T c , there is an additional change in the optical integral compared to that of the extrapolated normal state. For overdoped compounds, this change is a decrease, 13,14 but for underdoped and optimal doped compounds, two groups [9][10][11][12] found an increase, though other groups found either no additional effect 15,16 or a decrease. 17 The finite cutoff was taken into account in several theoretical analyses of the T dependence of the optical integralfor instance, work based on the Hubbard model, 18 the t-J model, 14 and the d-density-wave model.…”

mentioning

confidence: 97%

“…8 More recently, similar behavior was found for the in-plane conductivity. [9][10][11][12] The reported violation takes two forms. First, as the temperature is lowered in the normal state, the optical integral increases in magnitude.…”

mentioning

confidence: 99%

Optical integral in the cuprates and the question of sum-rule violation

Norman

Chubukov²,

Heumen

et al. 2007

Phys. Rev. B

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Much attention has been given to a possible violation of the optical sum rule in the cuprates and the connection this might have to kinetic energy lowering. The optical integral is composed of a cutoffindependent term ͑whose temperature dependence is a measure of the sum-rule violation͒, plus a cutoffdependent term that accounts for the extension of the Drude peak beyond the upper bound of the integral. We find that the temperature dependence of the optical integral in the normal state of the cuprates can be accounted for solely by the latter term, implying that the dominant contribution to the observed sum-rule violation in the normal state is due to the finite cutoff. This cutoff-dependent term is well modeled by a theory of electrons interacting with a broad spectrum of bosons.

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In-plane electrodynamics of the superconductivity inBi2Sr2CaCu2O8+

Cited by 59 publications

References 53 publications

Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-Tc copper oxides

Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-Tc copper oxides

Optical study of superconductingPr2CuOxwithx≃4

Optical integral in the cuprates and the question of sum-rule violation

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