Resonant Magnetic Excitations at High Energy in Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6.85</mml:mn></mml:msub></mml:math>

Pailhés, S.; Sidis, Y.; Bourges, P.; Hinkov, V.; Ivanov, Alexander S.; Ulrich, C.; Regnault, L.P.; Keimer, B.

doi:10.1103/physrevlett.93.167001

Cited by 118 publications

(230 citation statements)

References 39 publications

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“…1c. This excitation branch is also distinctly different from the well-known 'hourglass' excitations [18,19]: the latter only exist in a limited momentum range near q AF (the hatched area in Fig. 1c) and only become clearly incommensurate below T c in YBa 2 Cu 3 O 6+δ (YBCO) [15], whereas the former is observed all the way to q = 0 and above T c (Fig.…”

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confidence: 86%

“…3). Moreover, following the notion that the hourglass excitations are collective modes below the electron-hole continuum, they are expected only near q AF and cannot continuously disperse to q = 0 [19].After the magnetic nature of the excitation was verified with polarized neutrons, further quantitative measurements were carried out with unpolarized neutrons to benefit from the much higher neutron flux. Following standard procedure to extract a magnetic signal [19], phonons and spurious contributions were either removed by subtracting background obtained at high temperature (SI Section 6), or avoided by carefully choosing the measurement conditions (SI Section 5).…”

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confidence: 99%

“…Following standard procedure to extract a magnetic signal [19], phonons and spurious contributions were either removed by subtracting background obtained at high temperature (SI Section 6), or avoided by carefully choosing the measurement conditions (SI Section 5). Measurements at 2D Q-positions similar to those in Figs.…”

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confidence: 99%

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

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et al. 2010

Nature

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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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confidence: 99%

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confidence: 99%

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confidence: 99%

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

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et al. 2010

Nature

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“…That these incommensurate excitations disperse inwards towards the resonance energy was demonstrated in YBa 2 Cu 3 O 6.7 by Arai et al [35] and in YBa 2 Cu 3 O 6.85 by Bourges et al [36]. More recent measurements have established a common picture of the dispersion [27,37,38,28,39].…”

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confidence: 81%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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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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