Scaling of the transition temperature of hole-doped cuprate superconductors with the charge-transfer energy

Weber, Cédric; Yee, Chuck Hou; Haule, Kristjan; Kotliar, Gabriel

doi:10.1209/0295-5075/100/37001

Cited by 116 publications

(162 citation statements)

References 29 publications

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“…[44][45][46][47][48][49] For instance, empirically, the presence of the apex oxygen atoms makes the CuO 2 plane easier to dope with holes. 51,52 We can recall that HgBa 2 Ca 2 Cu 3 O 8+δ shows the largest T C having a large apical distance and an almost flat copper plane. 50 Also, the study of the effect of pressure on T C shows that the T*-phase superconductor with pyramidal copper coordination (having oxygen atoms at the apex) has a very large pressure enhancement of T C .…”

Section: Charge Transfer Energy and Orbital Admixturementioning

confidence: 95%

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

et al. 2015

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Detailed studies of the electronic states for Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy samples with different oxygen contents are presented here. The influence of oxygenation on the electronic states for the Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy system from the semiconducting to the superconducting state has been investigated by means of X-ray photoelectron spectroscopy (XPS). The XPS studies show that Mo is in a mixed Mo(V) and Mo(VI) oxidation state and Mo(V) is predominant over the Mo(VI) in the as-prepared (AP) sample. Yet annealing under an oxygen atmosphere enhances the Mo(VI) state. At the same time, a reduction in the copper species is observed. In the Cu 2p spectra, a larger energy separation between the satellite and main peaks (E(S)-E(M)) and a lower intensity ratio (I(S)/I(M)) are found to correlate with higher values of the superconducting transition temperature (T(C)). Analysis of these spectra within the Configuration Interaction (CI) model suggests that higher values of TC are related to lower values of the O 2p-Cu 3d charge transfer energy. The change in the Sr 3d and O 1s core level spectra correlates with the oxygen insertion in the (Mo/Cu)O(1+δ) chain site, after oxygenation. The hole concentration (Ph) in the copper plane has been obtained using the room temperature thermoelectric power (TEP) value; this shows an increasing tendency with increasing T(C), after oxygenation. From these experimental results, one observes that T(C)increases with decreasing charge transfer energy. This is, indeed, opposite to the accepted views and occurs in parallel with the shortening of the apical copper-oxygen distance (Cu(2)-O(2)) and the increasing of the CuO(2) plane buckling angle.

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Section: Charge Transfer Energy and Orbital Admixturementioning

confidence: 95%

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

et al. 2015

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“…1), 1,2 and the Cu-apical oxygen distance (h O ). [3][4][5][6][7][8][9][10][11] Now the pressure effect is exceptionally valuable as an in situ way to probe the structure dependence of T c . Regarding this, two general observations have been made for the cuprates: (i) T c tends to be enhanced under hydrostatic pressure, while (ii) uniaxial pressures produce anisotropic responses of T c .…”

Section: Introductionmentioning

confidence: 99%

Multiorbital analysis of the effects of uniaxial and hydrostatic pressure onTcin the single-layered cuprate superconductors

et al. 2012

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The origin of uniaxial and hydrostatic pressure effects on T c in the single-layered cuprate superconductors is theoretically explored. A two-orbital model, derived from first principles and analyzed with the fluctuation exchange approximation gives axial-dependent pressure coefficients ∂T c /∂P a > 0, ∂T c /∂P c < 0, with a hydrostatic response ∂T c /∂P > 0 for both La214 and Hg1201 cuprates, in qualitative agreement with experiments. Physically, this is shown to come from a unified picture in which higher T c is achieved with an "orbital distillation," namely, the less the d x 2 −y 2 main band is hybridized with the d z 2 and 4s orbitals the higher the T c . Some implications for obtaining higher T c materials are discussed.

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“…On the other, however, figuring out the detailed features behind the material dependency can provide the crucial hint for further understanding of superconductivity and other related properties. In fact, many directly or indirectly related theoretical studies have been performed on this issue13141516171819202122232425…”

mentioning

confidence: 99%

Quasiparticle self-consistent GW study of cuprates: electronic structure, model parameters and the two-band theory for Tc

Jang

Kotani

Kino

et al. 2015

Sci Rep

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Despite decades of progress, an understanding of unconventional superconductivity still remains elusive. An important open question is about the material dependence of the superconducting properties. Using the quasiparticle self-consistent GW method, we re-examine the electronic structure of copper oxide high-Tc materials. We show that QSGW captures several important features, distinctive from the conventional LDA results. The energy level splitting between and is significantly enlarged and the van Hove singularity point is lowered. The calculated results compare better than LDA with recent experimental results from resonant inelastic xray scattering and angle resolved photoemission experiments. This agreement with the experiments supports the previously suggested two-band theory for the material dependence of the superconducting transition temperature, Tc.

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Scaling of the transition temperature of hole-doped cuprate superconductors with the charge-transfer energy

Cited by 116 publications

References 29 publications

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

Multiorbital analysis of the effects of uniaxial and hydrostatic pressure onTcin the single-layered cuprate superconductors

Quasiparticle self-consistent GW study of cuprates: electronic structure, model parameters and the two-band theory for Tc

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Scaling of the transition temperature of hole-doped cuprate superconductors with the charge-transfer energy

Cited by 116 publications

References 29 publications

Core-level photoemission spectra of Mo0.3Cu0.7Sr2ErCu2Oy, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo0.3Cu0.7Sr2ErCu2Oy, a superconducting perovskite derivative. Unconventional structure–property relationships

Multiorbital analysis of the effects of uniaxial and hydrostatic pressure onTcin the single-layered cuprate superconductors

Quasiparticle self-consistent GW study of cuprates: electronic structure, model parameters and the two-band theory for Tc

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Product

Resources

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Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships

Core-level photoemission spectra of Mo_0.3Cu_0.7Sr₂ErCu₂O_y, a superconducting perovskite derivative. Unconventional structure–property relationships