Doping evolution of Zhang-Rice singlet spectral weight: A comprehensive examination by x-ray absorption spectroscopy

Chen, Y. J.; Jiang, Mi; Luo, Chih-Wei; Lin, Jiunn-Yuan; Wu, Kaung‐Hsiung; Lee, J. M.; Chen, J. M.; Kuo, Y. K.; Juang, Jenh‐Yih; Mou, Chung‐Yu

doi:10.1103/physrevb.88.134525

Cited by 25 publications

(29 citation statements)

References 25 publications

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“…While the valence of Cu remains 2 + (3 d 9 ) with hole doping, there is a clear emergence of a ligand hole state (3 d 9 L ) on the oxygen site, which is important for Cooper pairing4243. Detailed examination of the bulk cuprates have shown that this peak on both the Cu L -edge and O K -edge track directly with doping of the CuO 2 plane4445, which can be altered in the bulk by changing oxygen stoichiometry31, replacing Y with Ca4647, or doping at Cu sites48. Figure 3(a) shows the evolution of the polarization dependent Cu L -edge with increasing N together with a comparison to a thicker YBCO superlattice with bulk like absorption.…”

Section: Resultsmentioning

confidence: 99%

Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures

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Conti

et al. 2016

Sci Rep

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The superconductor-to-insulator transition (SIT) induced by means such as external magnetic fields, disorder or spatial confinement is a vivid illustration of a quantum phase transition dramatically affecting the superconducting order parameter. In pursuit of a new realization of the SIT by interfacial charge transfer, we developed extremely thin superlattices composed of high Tc superconductor YBa2Cu3O7 (YBCO) and colossal magnetoresistance ferromagnet La0.67Ca0.33MnO3 (LCMO). By using linearly polarized resonant X-ray absorption spectroscopy and magnetic circular dichroism, combined with hard X-ray photoelectron spectroscopy, we derived a complete picture of the interfacial carrier doping in cuprate and manganite atomic layers, leading to the transition from superconducting to an unusual Mott insulating state emerging with the increase of LCMO layer thickness. In addition, contrary to the common perception that only transition metal ions may respond to the charge transfer process, we found that charge is also actively compensated by rare-earth and alkaline-earth metal ions of the interface. Such deterministic control of Tc by pure electronic doping without any hindering effects of chemical substitution is another promising route to disentangle the role of disorder on the pseudo-gap and charge density wave phases of underdoped cuprates.

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Section: Resultsmentioning

confidence: 99%

Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures

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Middey

Conti

et al. 2016

Sci Rep

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“…The question is whether V/U can reach and go beyond the transition point. Recent x-ray absorption spectra [49] show that with increasing doping the doped holes start entering the Cu 3d states, hence the effective local U decreases (while the longer-ranged V is less influenced). Therefore, thé 2 2CDW phase is expected to be realized in the overdoped regime, in consistency with the experimental observation.…”

Section: Discussionmentioning

confidence: 99%

Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate

Ding

et al. 2018

New J. Phys.

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One of the key issues in unraveling the mystery of high T C superconductivity in the cuprates is to understand the normal state outside the superconducting dome. Here we perform scanning tunneling microscopy and spectroscopy measurements on a heavily overdoped, non-superconducting (Bi, Pb) 2 Sr 2 CuO 6+δ cuprate. Spectroscopic imaging reveals dispersive quasiparticle interferences (QPIs) and the Fourier transforms uncover the evolution of momentum space topology. More interestingly, we observe nanoscale patches of static charge order with2 2periodicity. Both the dispersive QPI and static charge order can be qualitatively explained by theoretical calculations, which reveal the unique electronic structure of strongly overdoped cuprate.The superconducting (SC) state of high T C cuprates exists within a 'dome' in the phase diagram in figure 1(a) and disappears both in the severely underdoped and heavily overdoped limits. Because the cuprates are widely believed to be doped Mott insulators [1], the underdoped regime near the parent compound has been extensively studied by various experimental techniques, which have revealed highly unusual phenomena such as the pseudogap phase [2] and complex charge/spin orders [3][4][5][6][7][8][9][10][11][12][13][14]. On the contrary, the heavily overdoped regime is much less explored because it is generally considered to be a rather conventional Fermi liquid (FL) state. This point has been illustrated by the crossover from a non-FL-like linear-in-temperature (T) resistivity at optimal doping to the T 2 dependent resistivity characteristic of Landau FL in the heavily overdoped regime [15][16][17][18][19], as well as quantum oscillation experiments revealing a single hole-like Fermi surface (FS) [20,21]. Because the physics of the FL is well-understood, the heavily overdoped limit can actually serve as another valid starting point, presumably more accessible than the Mott insulator limit, for understanding the origin of superconductivity in cuprates. Previous experiments on overdoped cuprates have revealed a number of important features regarding the electronic structure. Angle-resolved photoemission spectroscopy (ARPES) shows a FS topology transition from a (π, π)-centered hole-like pocket to a (0, 0)-centered electron-like pocket [22][23][24]. For single band tight-binding model [25,26], the two-dimensional FS topology change should be accompanied by a logarithmic divergence of electron density of states (DOS) known as the Van Hove singularity (VHS) [27]. Recent scanning tunneling microscopy (STM) experiments provide direct evidence for a VHS in heavily overdoped cuprate, as well as the existence of pseudogap [26]. However, it is still unclear how the electronic structure evolves across the phase boundary in the overdoped side. Especially, the charge order phenomenon, which is ubiquitous in underdoped cuprates and entangles intricately with superconductivity [7,[28][29][30], has been mostly neglected in the heavily overdoped non-SC regime of the phase diagram. In order to e...

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“…The technique is similar to that performed in Ref. [32]. The energy resolution of the monochromator was set to *0.2 eV for the Fe L edge.…”

Section: X-ray Absorption Spectroscopy (Xas)mentioning

confidence: 99%

Crucial Role of Site Disorder and Frustration in Unusual Magnetic Properties of Quasi-2D Triangular Lattice Antimonate Na4FeSbO6

et al. 2015

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The effect of antisite disorder in the layered sodium iron antimonate Na 4 FeSbO 6 was examined both experimentally and theoretically. The magnetic susceptibility and specific heat measurements show that Na 4 FeSbO 6 does not undergo a long-range antiferromagnetic order, unlike its structural analog Li 4 FeSbO 6 . The electron spin resonance yields the complicated picture of coexistence of two magnetic subsystems corresponding to two different Fe cation positions in the lattice (regular and antisite) and driving the magnetic properties of the Na 4 FeSbO 6 . This conclusion found perfect confirmation from both the Mössbauer and X-ray absorption data which

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Doping evolution of Zhang-Rice singlet spectral weight: A comprehensive examination by x-ray absorption spectroscopy

Cited by 25 publications

References 25 publications

Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures

Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures

Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate

Crucial Role of Site Disorder and Frustration in Unusual Magnetic Properties of Quasi-2D Triangular Lattice Antimonate Na4FeSbO6

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