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Stock, Chris; Buyers, W. J. L.; Cowley, R. A.; Clegg, Paul S.; Coldea, R.; Frost, Christopher; Liang, Ruixing; Peets, Darren C.; Bonn, D. A.; Hardy, W. N.; Birgeneau, R. J.

doi:10.1103/physrevb.71.024522

Cited by 184 publications

(222 citation statements)

References 53 publications

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“…Inelastic neutron scattering studies are consistent with an "hour glass" dispersion, wherein low energy spin excitations disperse out of IC wavevectors and merge or nearly-merge at the C wavevector to form a resonant spin excitation [23][24][25][26][27][28][29][30] . At higher energies, the excitations disperse out from the C wavevector, before turning over near the Brillouin zone boundaries 23,31,32 . Such a picture has been shown to be relevant even in the relatively low hole-doping regime of La 2−x Sr x CuO 4 , where the insulating ground state is characterized by socalled "diagonal" IC spin order 33 .…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

et al. 2013

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We present neutron scattering measurements on single crystals of lightly doped La2−xBaxCuO4, with 0 ≤ x ≤ 0.035. These reveal the evolution of the magnetism in this prototypical doped Mott insulator from a three dimensional (3D) commensurate (C) antiferromagnetic ground state, which orders at a relatively high TN , to a two dimensional (2D) incommensurate (IC) ground state with finite ranged static correlations, which appear below a relatively low effective TN . At low temperatures, the 2D IC magnetism co-exists with the 3D C magnetism for doping concentrations as low as ∼ 0.0125. We find no signal of a 3D C magnetic ground state by x ∼ 0.025, consistent with the upper limit of x ∼ 0.02 observed in the sister family of doped Mott insulators, La2−xSrxCuO4. The 2D IC ground states observed for 0.0125 ≤ x ≤ 0.035 are diagonal, and are rotated by 45 degrees within the orthorhombic basal plane compared with those previously reported for samples with superconducting ground states: La2−xBaxCuO4, with 0.05 ≤ x ≤ 0.095. We construct a phase diagram based solely on magnetic order parameter measurements, which displays much of the complexity of standard high temperature superconductivity phase diagrams discussed in the literature. Analysis of high energy-resolution inelastic neutron scattering at moderately low temperatures shows a progressive depletion of the very low energy dynamic magnetic susceptibility as x increases from 0.0125 to 0.035. This low energy, dynamic susceptibility falls off with increasing temperature on a scale much higher than the effective 2D IC TN appropriate to these materials. Appreciable dynamic 2D IC magnetic fluctuations inhabit much of the "pseudogap" regime of the phase diagram.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

et al. 2013

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“…[46] demonstrated that, for the incommensurate scattering at an energy corresponding to 70% of the saddle point, the intensity is quite anistropic, with maxima along the a * direction (perpendicular to the orientation of the CuO chains). A recent study of an array of highly detwinned crystals of YBa 2 Cu 3 O 6.85 by Hinkov et al [29] found substantial anisotropy in the peak scattered intensity for an energy of 85% of the saddle point, but also demonstrated that scattered intensity at that energy forms a circle about Q AF [see by Stock et al [47,28] suggest a strong anisotropy in the scattered intensity at 0.36E r , but essentially perfect isotropy for E > E r .…”

Section: Dispersionmentioning

confidence: 99%

“…8.3 is striking, and suggests that the magnetic dispersion spectrum may be universal in the cuprates [40,44]. Christensen et al [40], in La1.875Ba0.125CuO4 (filled circles) from [42], and in YBa2Cu3O6+x with x = 0.5 (squares) from Stock et al [28] and 0.6 (diamonds) from Hayden et al [27]. The energy has been scaled by the superexchange energy J for the appropriate parent insulator as given in For optimally doped YBa 2 Cu 3 O 6+x , the measured dispersive excitations are restricted to a narrower energy window, as shown in Fig.…”

Section: Dispersionmentioning

confidence: 99%

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Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

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“…In particular, we compare the formation of a resonant spin excitation (the "resonance peak") in three different ordered states: the DDW phase, the d x 2 −y 2 -wave superconducting (DSC) phase, and a phase with coexisting DDW and DSC order. The observation of the resonance peak in inelastic neutron scattering (INS) experiments 7,8,9,10,11,12,13,14,15 is one of the key experimental facts in the phenomenology of the high-T c cuprates. In the optimally and overdoped cuprates, the resonance peak appears below T c in the dynamical spin susceptibility at the antiferromagnetic wave vector Q = (π, π).…”

Section: Introductionmentioning

confidence: 99%

Dynamical spin susceptibility and the resonance peak in the pseudogap region of the underdoped cuprate superconductors

2006

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We present a study of the dynamical spin susceptibility in the pseudogap region of the high-Tc cuprate superconductors. We analyze and compare the formation of the so-called resonance peak, in three different ordered states: the d x 2 −y 2 -wave superconducting (DSC) phase, the d-density wave (DDW) state, and a phase with coexisting DDW and DSC order. An analysis of the resonance's frequency and momentum dependence in all three states reveals significant differences between them. In particular, in the DDW state, we find that a nearly dispersionless resonance excitation exists only in a narrow region around Q = (π, π). At the same time, in the coexisting DDW and DSC state, the dispersion of the resonance peak near Q is significantly changed from that in the pure DSC state. Away from (π, π), however, we find that the form and dispersion of the resonance excitation in the coexisting DDW and DSC state and pure DSC state are quite similar. Our results demonstrate that a detailed experimental measurement of the resonance's dispersion allows one to distinguish between the underlying phases -a DDW state, a DSC state, or a coexisting DDW and DSC statein which the resonance peak emerges.

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From incommensurate to dispersive spin-fluctuations: The high-energy inelastic spectrum in superconductingYBa2Cu3O6.5

Cited by 184 publications

References 53 publications

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Dynamical spin susceptibility and the resonance peak in the pseudogap region of the underdoped cuprate superconductors

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