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Harter, John; Maritato, L.; Shai, Daniel; Monkman, Eric; Nie, Yuefeng; Schlom, D. G.; Shen, Kyle

doi:10.1103/physrevlett.109.267001

Cited by 50 publications

(40 citation statements)

References 32 publications

(24 reference statements)

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“…By x = 0.10, the electron pocket at (π, 0) is well established and additional spectral weight is apparent at (π/2, π/2). This weight is due to the finite integration region of the map rather than a true band crossing at the Fermi level 5 . At higher binding energies, there is clear evidence for a coexisting LHB with intensity near (π/2, π/2) for all three doping levels.…”

Section: Methodsmentioning

confidence: 99%

“…In contrast, there exist only two families from which most of our understanding of electron doping in the cuprates is derived: Re 2−x Ce x CuO 4 , where Re is a rare earth element, and "infinite-layer" Sr 1−x La x CuO 2 1 . One conspicuous difference between electron and hole doping is the strength of (π, π) antiferromagnetic order, which can persist up to an electron doping of x = 0.14 2 and may even coexist with superconductivity in some materials [3][4][5] . In all of the hole-doped cuprates, on the other hand, antiferromagnetism is rapidly suppressed by x ≈ 0.03 and does not coexist with superconductivity.…”

Section: Introductionmentioning

confidence: 99%

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Doping evolution and polar surface reconstruction of the infinite-layer cuprateSr1−xLaxCuO2

et al. 2015

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We use angle-resolved photoemission spectroscopy to study the doping evolution of infinite-layer Sr1−xLaxCuO2 thin films grown by molecular-beam epitaxy. At low doping, the material exhibits a dispersive lower Hubbard band typical of the superconducting cuprate parent compounds. As carriers are added to the system, a continuous evolution from charge-transfer insulator to superconductor is observed, with the initial lower Hubbard band pinned well below the Fermi level and the development of a coherent low-energy band with electron doping. This two-component spectral function emphasizes the important role that strong local correlations play even at relatively high doping levels. Electron diffraction probes reveal a p(2 × 2) surface reconstruction of the material at low doping levels. Using a number of simple assumptions, we develop a model of this reconstruction based on the polar nature of the infinite-layer structure. Finally, we provide evidence for a thickness-controlled transition in ultrathin films of SrCuO2 grown on nonpolar SrTiO3, highlighting the diverse structural changes that can occur in polar complex oxide thin films.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Doping evolution and polar surface reconstruction of the infinite-layer cuprateSr1−xLaxCuO2

et al. 2015

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“…Moreover, in the SC state, a strong coupling between the charge carriers and the AF long-range order can push the nodal quasiparticles below the Fermi level, leading to nodeless d-wave SC without a change in the pairing symmetry of the order parameter [16]. Actually, such a feature had been also noticed in the single crystal Re 2−x Ce x CuO 4 samples [17][18][19].…”

mentioning

confidence: 92%

“…The model is subject to a local constraint σ c † r,σ c r,σ 1. The band parameters are adopted by t = 215 meV, t ′ = −0.16t, t ′′ = 0.2t, J = 0.3t, which are relevant to experiments [16]. Note that this model is expressed in the hole representation so that c † r,σ creates a hole in the Cu 3d x 2 −y 2 orbital and therefore the hopping parameters differ from the hole doped cases by a sign [23].…”

mentioning

confidence: 99%

“…Recently, by virtue of angular resolved photoemission spectroscopy measurement on the epitaxially stabilized Sr 1−x La x CuO 2 thin films by oxide molecular-beam epitaxy, Harter et al observed that the Fermi surface of the SC samples consists of a large electron pocket around (π, 0) and a tiny hole pocket surrounding (π/2, π/2), which perfectly fits into a tight-binding electronic band structure with an AF long-range order [16]. Moreover, in the SC state, a strong coupling between the charge carriers and the AF long-range order can push the nodal quasiparticles below the Fermi level, leading to nodeless d-wave SC without a change in the pairing symmetry of the order parameter [16].…”

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confidence: 99%

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Topological phase transition from nodal to nodeless d-wave superconductivity in electron-doped cuprate superconductors

Zhu

Zhang

2017

EPL

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-Unlike the hole-doped cuprates, both nodal and nodeless superconductivity (SC) are observed in the electron-doped cuprates. To understand these two types of SC states, we propose a unified theory by considering the two-dimensional t-J model in proximity to an antiferromagnetic (AF) long-range ordering state. Within the slave-boson mean-field approximation, the d-wave pairing symmetry is still the most energetically favorable even in the presence of the external AF field. In the nodal phase, it is found that the nodes carry vorticity and are protected by the adjoint symmetry of time-reversal and one unit lattice translation. Robust edge modes are obtained, suggesting the nodal d-wave SC being a topological weak-pairing phase. As decreasing the doping concentration or increasing the AF field, the nodes with opposite vorticity annihilate and the nodeless strong-pairing phase emerges. The topological phase transition is characterized by a critical point with anisotropic Bogoliubov quasiparticles, and a universal understanding is thus established for all electron-doped cuprates.Introduction. -Over thirty-year-effort, the consensus has been reached that the rich phase diagram in cuprate superconductors mainly arises from the strong electronic correlations [1,2]. The low-energy theory of the doped Mott insulator is believed to be captured by the single band t-J model [3]. There have been tremendous studies on the t-J model [4,5], most of which show d-wave pairing superconductivity (SC), which has been confirmed by hole-doped cuprates [6][7][8]. However, a remarkable asymmetry exists between hole doping (p-type) and electron doping (n-type) cuprates [9]. One of the most studied ntype family Re 2−x Ce x CuO 4 (Re is a trivalent rare-earth cation) displays antiferromagnetic (AF) long-range order up to a relatively high dopant concentration 0.14 (Ref. [10,11]) before the nodal d-wave SC appears. In contrast, the other n-type family A 1−x La x CuO 2 (A=Sr,Ca) compound has a nodeless SC gap, and the d-wave pairing symmetry is suspected [12][13][14][15].

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Opening a Nodal Gap by Fluctuating Spin-Density-Wave in Lightly Doped La $$_{2-x}$$ 2 - x Sr $$_x$$ x CuO $$_4$$ 4

Kapon¹

2019

Springer Theses

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We investigate whether the spin or charge degrees of freedom are responsible for the nodal gap in underdoped cuprates by performing inelastic neutron scattering and x-ray diffraction measurements on La2−xSrxCuO4, which is on the edge of the antiferromagnetic phase. We found that fluctuating incommensurate spin-density-wave (SDW) with a the bottom part of an hourglass dispersion exists even in this magnetic sample. The strongest component of these fluctuations diminishes at the same temperature where the nodal gap opens. X-ray scattering measurements on the same crystal show no signature of charge-density-wave (CDW). Therefore, we suggest that the nodal gap in the electronic band of this cuprate opens due to fluctuating SDW with no contribution from CDW.

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Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x

Cited by 50 publications

References 32 publications

Doping evolution and polar surface reconstruction of the infinite-layer cuprateSr1−xLaxCuO2

Doping evolution and polar surface reconstruction of the infinite-layer cuprateSr1−xLaxCuO2

Topological phase transition from nodal to nodeless d-wave superconductivity in electron-doped cuprate superconductors

Opening a Nodal Gap by Fluctuating Spin-Density-Wave in Lightly Doped La $$_{2-x}$$ 2 - x Sr $$_x$$ x CuO $$_4$$ 4

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