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On the Kinetic Energy Driven Superconductivity in the Two-Dimensional Hubbard Model. CONDENSED MATTER 2021. [DOI: 10.3390/condmat6010012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We investigate the role of kinetic energy for the stability of superconducting state in the two-dimensional Hubbard model on the basis of an optimization variational Monte Carlo method. The wave function is optimized by multiplying by correlation operators of site off-diagonal type. This wave function is written in an exponential-type form given as ψλ=exp(−λK)ψG for the Gutzwiller wave function ψG and a kinetic operator K. The kinetic correlation operator exp(−λK) plays an important role in the emergence of superconductivity in large-U region of the two-dimensional Hubbard model, where U is the on-site Coulomb repulsive interaction. We show that the superconducting condensation energy mainly originates from the kinetic energy in the strongly correlated region. This may indicate a possibility of high-temperature superconductivity due to the kinetic energy effect in correlated electron systems.
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Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems. CONDENSED MATTER 2019. [DOI: 10.3390/condmat4020057] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a system with interaction of large-energy scale. Empirically, this is true for superconductors that have been found so far. In the second half of this paper, we discuss cuprate high-temperature superconductors. We argue that superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. We show the results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method. A high-temperature superconducting phase will exist in the strongly correlated region.
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Marrani AG, Novelli V, Sheehan S, Dowling DP, Dini D. Probing the redox states at the surface of electroactive nanoporous NiO thin films. ACS APPLIED MATERIALS & INTERFACES 2014; 6:143-152. [PMID: 24325361 DOI: 10.1021/am403671h] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nanoporous NiO thin film electrodes were obtained via plasma-assisted microwave sintering and characterized by means of a combination of electrochemical techniques and X-ray photoelectron spectroscopy (XPS). The aim of this study is the elucidation of the nature of the surface changes introduced by the redox processes of this nanostructured material. NiO undergoes two distinct electrochemical processes of oxidation in aqueous electrolyte with the progress of NiO anodic polarization. These findings are consistent with the sequential formation of oxyhydroxide species at the surface, the chemical nature of which was assessed by XPS. Electronic relaxation effects in the Ni 2p spectra clearly indicated that the superficial oxyhydroxide species resulted to be β-NiOOH and γ-NiOOH. We also show for the first time spectral evidence of an electrochemically generated Ni(IV) species. This study has direct relevance for those applications in which NiO electrodes are utilized in aqueous electrolyte, namely catalytic water splitting or electrochromism, and may constitute a starting point for the comprehension of electronic phenomena at the NiO/organic electrolyte interface of cathodic dye-sensitized solar cells (p-DSCs).
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Affiliation(s)
- Andrea G Marrani
- Department of Chemistry, "Sapienza" University of Rome , Piazzale Aldo Moro 5, 00185 Rome, Italy
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Achkar AJ, He F, Sutarto R, Geck J, Zhang H, Kim YJ, Hawthorn DG. Resonant X-ray scattering measurements of a spatial modulation of the Cu 3d and O 2p energies in stripe-ordered cuprate superconductors. PHYSICAL REVIEW LETTERS 2013; 110:017001. [PMID: 23383826 DOI: 10.1103/physrevlett.110.017001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Indexed: 06/01/2023]
Abstract
A prevailing description of the stripe phase in underdoped cuprate superconductors is that the charge carriers (holes) phase segregate on a microscopic scale into hole-rich and hole-poor regions. We report resonant elastic x-ray scattering measurements of stripe-ordered La(1.475)Nd(0.4)Sr(0.125)CuO(4) at the Cu L and O K absorption edges that identify an additional feature of stripe order. Analysis of the energy dependence of the scattering intensity reveals that the dominant signature of the stripe order is a spatial modulation in the energies of Cu 3d and O 2p states rather than the large modulation of the charge density (valence) envisioned in the common stripe paradigm. These energy shifts are interpreted as a spatial modulation of the electronic structure and may point to a valence-bond-solid interpretation of the stripe phase.
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Affiliation(s)
- A J Achkar
- Department of Physics and Astronomy, University of Waterloo, Waterloo N2L 3G1, Canada
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Shearer J, Callan PE, Masitas CA, Grapperhaus CA. Influence of sequential thiolate oxidation on a nitrile hydratase mimic probed by multiedge X-ray absorption spectroscopy. Inorg Chem 2012; 51:6032-45. [PMID: 22591049 DOI: 10.1021/ic202453c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Nitrile hydratases (NHases) are Fe(III)- and Co(III)-containing hydrolytic enzymes that convert nitriles into amides. The metal-center is contained within an N(2)S(3) coordination motif with two post-translationally modified cysteinates contained in a cis arrangement, which have been converted into a sulfinate (R-SO(2)(-)) and a sulfenate (R-SO(-)) group. Herein, we utilize Ru L-edge and ligand (N-, S-, and P-) K-edge X-ray absorption spectroscopies to probe the influence that these modifications have on the electronic structure of a series of sequentially oxidized thiolate-coordinated Ru(II) complexes ((bmmp-TASN)RuPPh(3), (bmmp-O(2)-TASN)RuPPh(3), and (bmmp-O(3)-TASN)RuPPh(3)). Included is the use of N K-edge spectroscopy, which was used for the first time to extract N-metal covalency parameters. We find that upon oxygenation of the bis-thiolate compound (bmmp-TASN)RuPPh(3) to the sulfenato species (bmmp-O(2)-TASN)RuPPh(3) and then to the mixed sulfenato/sulfinato speices (bmmp-O(3)-TASN)RuPPh(3) the complexes become progressively more ionic, and hence the Ru(II) center becomes a harder Lewis acid. These findings are reinforced by hybrid DFT calculations (B(38HF)P86) using a large quadruple-ζ basis set. The biological implications of these findings in relation to the NHase catalytic cycle are discussed in terms of the creation of a harder Lewis acid, which aids in nitrile hydrolysis.
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Affiliation(s)
- Jason Shearer
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, USA.
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Rondinelli JM, Spaldin NA. Structure and properties of functional oxide thin films: insights from electronic-structure calculations. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:3363-3381. [PMID: 21748811 DOI: 10.1002/adma.201101152] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Indexed: 05/27/2023]
Abstract
The confluence of state-of-the-art electronic-structure computations and modern synthetic materials growth techniques is proving indispensable in the search for and discovery of new functionalities in oxide thin films and heterostructures. Here, we review the recent contributions of electronic-structure calculations to predicting, understanding, and discovering new materials physics in thin-film perovskite oxides. We show that such calculations can accurately predict both structure and properties in advance of film synthesis, thereby guiding the search for materials combinations with specific targeted functionalities. In addition, because they can isolate and decouple the effects of various parameters which unavoidably occur simultaneously in an experiment-such as epitaxial strain, interfacial chemistry and defect profiles-they are able to provide new fundamental knowledge about the underlying physics. We conclude by outlining the limitations of current computational techniques, as well as some important open questions that we hope will motivate further methodological developments in the field.
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Affiliation(s)
- James M Rondinelli
- X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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Takahashi M, Igarashi JI, Semba T. Charge excitations in cuprate and nickelate in resonant inelastic x-ray scattering. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:064236. [PMID: 21715938 DOI: 10.1088/0953-8984/21/6/064236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We analyze the resonant inelastic x-ray scattering (RIXS) spectra at the Cu and Ni K-edges in La(2)CuO(4) and La(2)NiO(4), respectively. We make use of the Keldysh-Green function formalism, in which the RIXS intensity is described by a product of the incident-photon-dependent factor and the density-density correlation function in the 3d states. The former factor is calculated using the 4p density of states given by an ab initio band structure calculation and the latter using the wavefunctions given by a Hartree-Fock calculation of a multiorbital tight-binding model. The initial state is described within the Hartree-Fock approximation and the electron correlations on charge excitations are treated within the random phase approximation. The calculated RIXS spectra reproduce well several characteristic features in the experiments. Although several groups have interpreted the RIXS peaks as bound excitons, our calculation indicates that they should be interpreted as band-to-band excitations augmented by electron correlations. The difference in RIXS spectra between La(2)CuO(4) and La(2)NiO(4) is explained from this point of view.
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Affiliation(s)
- Manabu Takahashi
- Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan
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Sarangi R, Aboelella N, Fujisawa K, Tolman WB, Hedman B, Hodgson KO, Solomon EI. X-ray absorption edge spectroscopy and computational studies on LCuO2 species: Superoxide-Cu(II) versus peroxide-Cu(III) bonding. J Am Chem Soc 2007; 128:8286-96. [PMID: 16787093 PMCID: PMC2556900 DOI: 10.1021/ja0615223] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The geometric and electronic structures of two mononuclear CuO2 complexes, [Cu(O2){HB(3-Ad-5-(i)Prpz)3}] (1) and [Cu(O2)(beta-diketiminate)] (2), have been evaluated using Cu K- and L-edge X-ray absorption spectroscopy (XAS) studies in combination with valence bond configuration interaction (VBCI) simulations and spin-unrestricted broken symmetry density functional theory (DFT) calculations. Cu K- and L-edge XAS data indicate the Cu(II) and Cu(III) nature of 1 and 2, respectively. The total integrated intensity under the L-edges shows that the 's in 1 and 2 contain 20% and 28% Cu character, respectively, indicative of very covalent ground states in both complexes, although more so in 1. Two-state VBCI simulations also indicate that the ground state in 2 has more Cu (/3d8) character. DFT calculations show that the in both complexes is dominated by O2(n-) character, although the O2(n-) character is higher in 1. It is shown that the ligand L plays an important role in modulating Cu-O2 bonding in these LCuO2 systems and tunes the ground states of 1 and 2 to have dominant Cu(II)-superoxide-like and Cu(III)-peroxide-like character, respectively. The contributions of ligand field (LF) and the charge on the absorbing atom in the molecule (Q(mol)M) to L- and K-edge energy shifts are evaluated using DFT and time-dependent DFT calculations. It is found that LF makes a dominant contribution to the edge energy shift, while the effect of Q(mol)M is minor. The charge on the Cu in the Cu(III) complex is found to be similar to that in Cu(II) complexes, which indicates a much stronger interaction with the ligand, leading to extensive charge transfer.
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Affiliation(s)
- Ritimukta Sarangi
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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Neupane KP, Shearer J. The influence of amine/amide versus bisamide coordination in nickel superoxide dismutase. Inorg Chem 2007; 45:10552-66. [PMID: 17173410 DOI: 10.1021/ic061156o] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nickel superoxide dismutase (NiSOD) is a mononuclear nickel-containing metalloenzyme that catalyzes the disproportionation of superoxide by cycling between NiII and NiIII oxidation states. In the reduced NiII oxidation state, the metal center is ligated by two cysteinate sulfurs, one amide nitrogen, and one amine nitrogen (from the N-terminus), while in the oxidized NiIII state, an imidazole nitrogen coordinates to the metal center. Herein, we expand on a previous report in which we described a functional metallopeptide-based NiSOD model compound [NiII(SODM1)] (SODM1 = H2N-HCDLPCGVYDPA-COOH) by exploring how acylation of the N-terminus (producing [NiII(SODM1-Ac)]) influences the properties of the metallopeptide. Titration results, GPC data, and mass-spectrometry data demonstrate that NiII coordinates to SODM1-Ac in a 1:1 ratio, while variable pH studies show that NiII coordination is strong at a pH of 7.5 and above but not observed below a pH of 6.2. This is higher than [NiII(SODM1)] by approximately 1.0 pH unit consistent with bisamide ligation. Ni K-edge XAS demonstrates that the NiII center is coordinated in a square-planar NiN2S2 coordination environment with Ni-N distances of 1.846(4) A and Ni-S distances of 2.174(3) A. Comparison of the electronic absorption and CD spectrum of [NiII(SODM1)] versus [NiII(SODM1-Ac)] in conjunction with time-dependent DFT calculations suggests a decrease in Ni covalency in the acylated versus unacylated metallopeptide. This decrease in covalency was also supported by DFT calculations and Ni L-edge XAS. [NiII(SODM1-Ac)] has a quasireversible NiII/NiIII redox couple of 0.49(1) V vs Ag/AgCl, which represents a -0.2 V shift compared with [NiII(SODM1)], while the peak separation suggests a change in the coordination environment upon oxidation (i.e., axial imidazole ligation). Using the xanthine/xanthine oxidase assay, we determine that [NiII(SODM1-Ac)] is less active than [NiII(SODM1)] by over 2 orders of magnitude (IC50 = 3(1) x 10-5 vs 2(1) x 10-7 M). Possible reasons for the decrease in activity are discussed.
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Affiliation(s)
- Kosh P Neupane
- Department of Chemistry, University of Nevada, Reno, NV 89557, USA
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Hu Z, Mazumdar C, Kaindl G, de Groot F, Warda S, Reinen D. Valence electron distribution in La2Li1/2Cu1/2O4, Nd2Li1/2Ni1/2O4, and La2Li1/2Co1/2O4. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)01135-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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On the electronic structure of Cu(III) and Ni(III) in La2Li1/2Cu1/2O4, Nd2Li1/2Ni1/2O4, and Cs2KCuF6. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00096-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Belinicher VI, Chernyshev AL, Shubin VA. Single-hole dispersion relation for the real CuO2 plane. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:14914-14917. [PMID: 9985535 DOI: 10.1103/physrevb.54.14914] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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13
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Qvarford M, Söderholm S, Chiaia G, Nyholm R, Andersen JN, Lindau I, Karlsson UO, Leonyuk L, Nilsson A, Mårtensson N. Doping dependence of the O 1s core-level photoemission in Bi-Sr-Ca-Cu-O superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R14753-R14756. [PMID: 9983347 DOI: 10.1103/physrevb.53.r14753] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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14
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Pellegrin E, Zaanen J, Lin H, Meigs G, Chen CT, Ho GH, Eisaki H, Uchida S. O 1s near-edge x-ray absorption of La2-xSrxNiO4+ delta : Holes, polarons, and excitons. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:10667-10679. [PMID: 9982631 DOI: 10.1103/physrevb.53.10667] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Belinicher VI, Chernyshev AL, Shubin VA. Generalized t-t'-J model: Parameters and single-particle spectrum for electrons and holes in copper oxides. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:335-342. [PMID: 9981982 DOI: 10.1103/physrevb.53.335] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Okada K, Kotani A. Nonlocal screening effects on core-level photoemission spectra investigated by large-cluster models. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:4794-4800. [PMID: 9981660 DOI: 10.1103/physrevb.52.4794] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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17
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Plakida NM, Hayn R, Richard J. Two-band singlet-hole model for the copper oxide plane. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:16599-16607. [PMID: 9978662 DOI: 10.1103/physrevb.51.16599] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Butorin SM, Guo J, Wassdahl N, Skytt P, Nordgren J, Ma Y, Ström C, Johansson L, Qvarford M. Electronic structure of Bi2Sr2CaCu2O8+ delta and Tl2Ba2CaCu2O8: Near-O-1s-threshold excitation x-ray fluorescence studies. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:11915-11923. [PMID: 9977933 DOI: 10.1103/physrevb.51.11915] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Unger P, Fulde P. Electronic excitations in electron-doped cuprate superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:9245-9252. [PMID: 9977566 DOI: 10.1103/physrevb.51.9245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Eskes H, Oles AM, Meinders MB, Stephan W. Spectral properties of the Hubbard bands. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:17980-18002. [PMID: 9976228 DOI: 10.1103/physrevb.50.17980] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Barriquand F, Sawatzky GA. Superexchange, hole-hole interactions, and oxygen spin dynamics in high-Tc superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:16649-16667. [PMID: 9976054 DOI: 10.1103/physrevb.50.16649] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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22
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Belinicher VI, Chernyshev AL, Popovich LV. Range of the t-J model parameters for CuO2 planes: Experimental data constraints. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:13768-13777. [PMID: 9975578 DOI: 10.1103/physrevb.50.13768] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Crljen Z, Luberek J, Wendin G, Levine ZH. Collective response and molecular effects in cluster photoionization: A one-center time-dependent calculation for BaO2. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:3529-3532. [PMID: 9911307 DOI: 10.1103/physreva.50.3529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Belinicher VI, Chernyshev AL. Consistent low-energy reduction of the three-band model for copper oxides with O-O hopping to the effective t-J model. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:9746-9756. [PMID: 10009774 DOI: 10.1103/physrevb.49.9746] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Rubio J, Refolio MC. Nonplanar orbital effects on charge and spin fluctuations in doped cuprate superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:9125-9137. [PMID: 10009695 DOI: 10.1103/physrevb.49.9125] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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26
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Sawatzky GA. Intersite interactions in Cu L-edge XPS, XAS, and XES of doped and undoped Cu compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3473-3482. [PMID: 10011211 DOI: 10.1103/physrevb.49.3473] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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27
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Sawatzky GA, Groen WA. Electronic structure of Bi2Sr2Ca1-xYxCu2O8+ delta : Cu 2p x-ray-photoelectron spectra and occupied and unoccupied low-energy states. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:1407-1416. [PMID: 10010453 DOI: 10.1103/physrevb.49.1407] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Unger P, Fulde P. Spectral function of holes in the Emery model. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:16607-16622. [PMID: 10008245 DOI: 10.1103/physrevb.48.16607] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Feiner LF. Spectral-weight transfer in effective single-band models for the high-Tc cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:16857-16860. [PMID: 10008282 DOI: 10.1103/physrevb.48.16857] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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30
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Chainani A, Mathew M, Sarma DD. Electron spectroscopic investigation of the semiconductor-metal transition in La1-xSrxMnO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:15397-15403. [PMID: 10005928 DOI: 10.1103/physrevb.47.15397] [Citation(s) in RCA: 184] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Anderson RO, Claessen R, Allen JW, Olson CG, Janowitz C, Liu LZ, Park J, Maple MB, Dalichaouch Y, Jardim RF, Early EA, Oh S, Ellis WP. Luttinger Fermi surface of metallic gap spectral weight in Nd1.85Ce0.15CuO4-y. PHYSICAL REVIEW LETTERS 1993; 70:3163-3166. [PMID: 10053791 DOI: 10.1103/physrevlett.70.3163] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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32
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Eskes H, Sawatzky GA. Strong nonlocal contributions to Cu 2p photoelectron spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:11462-11469. [PMID: 10005286 DOI: 10.1103/physrevb.47.11462] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sawatzky GA. Nonlocal screening effects in 2p x-ray photoemission spectroscopy core-level line shapes of transition metal compounds. PHYSICAL REVIEW LETTERS 1993; 70:2459-2462. [PMID: 10053567 DOI: 10.1103/physrevlett.70.2459] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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34
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Unger P, Fulde P. Electronic excitation spectra of the Emery model. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8947-8963. [PMID: 10004943 DOI: 10.1103/physrevb.47.8947] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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35
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Wang YJ, Newton MD, Davenport JW. Electronic structure and magnetic coupling in copper oxide superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:11935-11951. [PMID: 10003091 DOI: 10.1103/physrevb.46.11935] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Rubio J, Refolio MC. Doping dependence of the density of states for CuO2 clusters in the Hubbard model. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:11110-11116. [PMID: 10002976 DOI: 10.1103/physrevb.46.11110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Dagotto E, Moreo A, Ortolani F, Poilblanc D, Riera J. Static and dynamical properties of doped Hubbard clusters. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10741-10760. [PMID: 10000980 DOI: 10.1103/physrevb.45.10741] [Citation(s) in RCA: 112] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hybertsen MS, Stechel EB, Foulkes WM, Schlüter M. Model for low-energy electronic states probed by x-ray absorption in high-Tc cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10032-10050. [PMID: 10000892 DOI: 10.1103/physrevb.45.10032] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Schüttler H, Fedro AJ. Copper-oxygen charge excitations and the effective-single-band theory of cuprate superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:7588-7591. [PMID: 10000566 DOI: 10.1103/physrevb.45.7588] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bar-Deroma R, Felsteiner J, Brener R, Ashkenazi J. Auger spectra and band structure of La1.85Sr0.15CuO4 and La1.85Ba0.15CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:2361-2370. [PMID: 10001759 DOI: 10.1103/physrevb.45.2361] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Krol A, Ming ZH, Kao YH, Nücker N, Roth G, Fink J, Smith GC, Park KT, Yu J, Freeman AJ, Erband A, Müller-Vogt G, Karpinski J, Kaldis E, Schönmann K. Hole states in CuO2 planes and Cu-O chains of YBa2Cu3O7 and YBa2Cu4O8 probed by soft-x-ray absorption spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:2581-2584. [PMID: 10001802 DOI: 10.1103/physrevb.45.2581] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Eskes H, Kuiper P, Sawatzky GA. Electronic structure of Li-doped NiO. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:1612-1622. [PMID: 10001659 DOI: 10.1103/physrevb.45.1612] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Dagotto E, Moreo A, Ortolani F, Riera J, Scalapino DJ. Density of states of doped Hubbard clusters. PHYSICAL REVIEW LETTERS 1991; 67:1918-1921. [PMID: 10044284 DOI: 10.1103/physrevlett.67.1918] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wieland JL, Eskes H, Kuiper P, Sawatzky GA, Turner TS. Electronic structure of CoO, Li-doped CoO, and LiCoO2. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:6090-6103. [PMID: 9998470 DOI: 10.1103/physrevb.44.6090] [Citation(s) in RCA: 249] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kuiper P, Sawatzky GA, Fujimori A, Hosoya S. Unoccupied density of states of La2-xSrxNiO4+ delta studied by polarization-dependent x-ray-absorption spectroscopy and bremsstrahlung isochromat spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:4570-4575. [PMID: 10000112 DOI: 10.1103/physrevb.44.4570] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Eskes H, Meinders MB, Sawatzky GA. Anomalous transfer of spectral weight in doped strongly correlated systems. PHYSICAL REVIEW LETTERS 1991; 67:1035-1038. [PMID: 10045053 DOI: 10.1103/physrevlett.67.1035] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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