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Bourges, P.; Regnault, L.P.; Sidis, Y.; Vettier, C.

doi:10.1103/physrevb.53.876

Cited by 144 publications

(201 citation statements)

References 34 publications

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“…39,40,41,42,43 A similar resonance feature at the (π, π) wavevector is observed in underdoped YBa 2 Cu 3 O 6+x , but at a reduced energy. 44,45,46,47 The resonance was also found in Bi 2 Sr 2 CaCu 2 O 8+δ , both in the optimally doped 43,48 and overdoped 48 regime.…”

Section: Coupling To the Magnetic Resonance Modementioning

confidence: 56%

“…The momentum width of the spin fluctuation spectrum is minimal at the resonance energy, 42,54 where it is (in contrast to the off-resonant momentum width) only weakly doping dependent, with a full width of about 0.22 A −1 . 54,55,56 This corresponds to a correlation length ξ sf l of about two lattice spacings.…”

Section: Coupling To the Magnetic Resonance Modementioning

confidence: 99%

“…41,57 On approaching T c from below, the resonance energy does not shift towards lower energy, 41,42,44 but its intensity decreases towards T c , following an order parameter like behavior. 39,40,42,44,57 With underdoping, the intensity at Q = (π, π) increases from about 1.6 µ 2 B for YBa 2 Cu 3 O 7 to about 2.6 µ 2 B per unit cell volume for…”

Section: Coupling To the Magnetic Resonance Modementioning

confidence: 99%

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Effect of the magnetic resonance on the electronic spectra ofhigh−Tcsuperconductors

2003

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We explain recent experimental results on the superconducting state spectral function as obtained by angle resolved photoemission, as well as by tunneling, in high Tc cuprates. In our model, electrons are coupled to the resonant spin fluctuation mode observed in inelastic neutron scattering experiments, as well as to a gapped continuum. We show that, although the weight of the resonance is small, its effect on the electron self energy is large, and can explain various dispersion anomalies seen in the data. In agreement with experiment, we find that these effects are a strong function of doping. We contrast our results to those expected for electrons coupled to phonons.

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Section: Coupling To the Magnetic Resonance Modementioning

confidence: 56%

Section: Coupling To the Magnetic Resonance Modementioning

confidence: 99%

Section: Coupling To the Magnetic Resonance Modementioning

confidence: 99%

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Effect of the magnetic resonance on the electronic spectra ofhigh−Tcsuperconductors

2003

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“…However, just as for energy scans near the 2D zone center with polarized neutrons, we did not find any comparison in the literature between energy scans at small H and K values at different temperatures. Moreover, the excitation branch reported here sets in near T*, but comparisons that received most attention previously were for temperatures across T c [19,30,32,34,38,[42][43][44]. Such comparisons were optimized to highlight the resonance, but might have missed a substantial part of the intensity change due to the excitation branch.…”

Section: S9 How Could the Excitation Branch Have Been Missed So Far?mentioning

confidence: 99%

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Balédent

et al. 2010

Nature

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123

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The elucidation of the pseudogap phenomenon of the cuprates, a set of anomalous physical properties below the characteristic temperature T * and above the superconducting transition temperature T c , has been a major challenge in condensed matter physics for the past two decades [1]. Following initial indications of broken time-reversal symmetry in photoemission experiments [2], recent polarized neutron diffraction work demonstrated the universal existence of an unusual magnetic order below T * [3,4]. These findings have the profound implication that the pseudogap regime constitutes a genuine new phase of matter rather than a mere crossover phenomenon. They are furthermore consistent with a particular type of order involving circulating orbital currents, and with the notion that the phase diagram is controlled by a quantum critical point [5]. Here we report inelastic neutron scattering results for HgBa 2 CuO 4+δ (Hg1201) that reveal a fundamental collective magnetic mode associated with the unusual order, and that further support this picture. The mode's intensity rises below the same temperature T * and its dispersion is weak, as expected for an Ising-like order parameter [6]. Its energy of 52-56 meV and its enormous integrated spectral weight render it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies [7][8][9][10].Inelastic neutron scattering (INS) is the most direct probe of magnetic excitations in solids. In the present work, we employed both spin-polarized and unpolarized INS measurements. The use of spin-polarized neutrons was crucial to unambiguously identify the magnetic response reported here, because such neutrons are separately collected according to whether their spins have or have not been flipped in the scattering process, which renders magnetic and nuclear scattering clearly distinguishable (Supplementary Information Section 1). Our measurements were carried out on three samples made of co-aligned crystals, which were grown by a self-flux method [11] and free from substantial macroscopic impurity phases and inhomogeneity (SI Section 2). Hg1201 exhibits the highest value of T c of all cuprates with one copper-oxygen plane per unit cell, has a simple tetragonal structure, and is furthermore thought to be relatively free of disorder effects [12,13]. The scattering wave vector is quoted as Q = Ha* + Kb* + Lc* ≡ (H,K,L) in reciprocal lattice units (r.l.u.). Neutron intensities are presented in normalized units in most figures to facilitate a direct comparison of the intensity among the measurements (SI Section 3).Spin-polarized INS data ( Fig. 1) demonstrate the existence of a magnetic excitation throughout the two-dimensional (2D) Brillouin zone in a nearly-optimally-doped sample (T c = 94.5 ± 2 K, denoted as OP95). Energy scans in the spin-flip channel reveal a resolution-limited feature at low temperatures, with a weak dispersion and a maximum of 56 meV at the 2D zone-corner q AF (H = K = 0.5). The feature cannot be due to a p...

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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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Inelastic-neutron-scattering study of antiferromagnetic fluctuations inYBa2Cu3

Cited by 144 publications

References 34 publications

Effect of the magnetic resonance on the electronic spectra ofhigh−Tcsuperconductors

Effect of the magnetic resonance on the electronic spectra ofhigh−Tcsuperconductors

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

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

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