Observation of a 500 meV Collective Mode in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Nd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:m

Hill, J. P.; Blumberg, G.; Kim, Yong Baek; Ellis, David S.; Wakimoto, Shuichi; Birgeneau, R. J.; Komiya, Seiki; Ando, Yoichi; Liang, Bing; Greene, R. L.; Casa, D.; Gög, T.

doi:10.1103/physrevlett.100.097001

Cited by 115 publications

(135 citation statements)

References 34 publications

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“…[4][5][6][7] Hill et al have succeeded in detecting the magnetic excitation spectra peaked around 500 meV energy region at the Cu K-edge in La 2 CuO 4 . 4 The following theories have revealed that the obtained signals are attributed to the two-magnon excitation from the antiferromagnetic (AFM) ground state brought about by the presence of the core hole potential during the intermediate states. [8][9][10] Since then, plenty of measurements have been reported out at the Cu K-edge as well as Cu L 3 -edge.…”

Section: Introductionmentioning

confidence: 99%

Theory ofL-edge resonant inelastic x-ray scattering for magnetic excitations in two-leg spin ladders

Nagao

Igarashi

2012

Phys. Rev. B

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We study the magnetic excitation spectra of Cu L2,3-edge resonant inelastic x-ray scattering (RIXS) from the spin-liquid ground state in two-leg spin ladder cuprates. Applying the projection method developed by the present authors, we have derived the formulas of the magnetic RIXS spectra, which are expressed by one-and two-spin correlation functions in the polarization changing and preserving channels, respectively. The one-spin correlation function includes both one-and two-triplon excitations and they are picked up separately by choosing rung wave vector −qa = π and 0, respectively. An application to Sr14Cu24O41 reveals that the calculated RIXS spectrum captures well the dispersive behavior shown by the lower boundary of two-triplon continuum. By adjusting the geometrical configuration of the measurement, one-triplon dispersion around the zone center could be detectable in the RIXS experiment. The observed weak intensity in the higher energy region might be attributed to the two-spin correlation function, which could be detected more clearly at the M3-edge RIXS spectra.

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Section: Introductionmentioning

confidence: 99%

Theory ofL-edge resonant inelastic x-ray scattering for magnetic excitations in two-leg spin ladders

Nagao

Igarashi

2012

Phys. Rev. B

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“…Resonant X-ray emission spectroscopy (de Groot & Kotani, 2008) and X-rayRaman-scattering-based XANES (Gordon et al, 2008) would profit from an energy resolution of ÁE ' 300 meV. Resonant IXS, for example at the K, L and M edges of 3d, 4d and 5d transition metals, with ÁE < $ 100 meV is nowadays a powerful tool for studying collective magnetic and orbital excitations (Hill et al, 2005;Schlappa et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Improving the energy resolution of bent crystal X-ray spectrometers with position-sensitive detectors

Honkanen

Verbeni

Simonelli

et al. 2014

J Synchrotron Radiat

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Wavelength-dispersive high-resolution X-ray spectrometers often employ elastically bent crystals for the wavelength analysis. In a preceding paper [Honkanen et al. (2014). J. Synchrotron Rad. 21, 104-110] a theory for quantifying the internal stress of a macroscopically large spherically curved analyser crystal was presented. Here the theory is applied to compensate for the corresponding decrease of the energy resolution. The technique is demonstrated with a Johann-type spectrometer using a spherically bent Si(660) analyser in near-backscattering geometry, where an improvement in the energy resolution from 1.0 eV down to 0.5 eV at 9.7 keV incident photon energy was observed.

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“…An independent picture of magnetic and charge excitations has now been gained by resonant inelastic X-ray scattering (RIXS) experiments at the Cu K edge 22 and Cu L 3 edge [23][24][25][26][27][28] in the cuprates and at the Fe L 3 edge in the iron pnictides 29 . RIXS offers some interesting advantages, such as the possibility of measuring small-volume samples, additional flexibility from polarization control and complementary information from the Cu (single magnons) and O (two magnons) edges 30 .…”

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confidence: 99%

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

et al. 2014

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The high-T c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons-of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi 2 Sr 2 CaCu 2 O 8 þ d (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle-hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations.

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Observation of a 500 meV Collective Mode inLa2−xSrxCuO4andNd2

Cited by 115 publications

References 34 publications

Theory ofL-edge resonant inelastic x-ray scattering for magnetic excitations in two-leg spin ladders

Theory ofL-edge resonant inelastic x-ray scattering for magnetic excitations in two-leg spin ladders

Improving the energy resolution of bent crystal X-ray spectrometers with position-sensitive detectors

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

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