Magnetic excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>-edge resonant inelastic x-ray scattering from cuprate compounds

Igarashi, Jun–ichi; Nagao, Tatsuya

doi:10.1103/physrevb.85.064421

Cited by 35 publications

(57 citation statements)

References 47 publications

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“…The P (0) σ and P (1) σ correspond to the spin-conserving and the spin-flip processes, respectively, whose values for j = 3 2 are listed in Table I for α i and α f along the x, y, and z axes. Note that they retain finite values even for the z polarization, which contrasts with the case of the undoped cuprates where the z polarization has no finite contribution [25]. It can be confirmed that they vanish for j = 1 2 , consistent with the L 2 absorption experiment [10].…”

Section: B Excitation and Deexcitation Of Core Hole At A Single Sitesupporting

confidence: 63%

“…The coefficient D α (jm,σ ) describes the dependence on the 5d and core-hole states, which can be calculated in a similar manner to that explained in Ref. [25] for cuprates.…”

Section: A Second-order Optical Processmentioning

confidence: 96%

“…By neglecting (ω i ), Eqs. (3.14) and (3.18) are summarized into an expression, which is similar to that for the undoped cuprates [25][26][27][28]34], as…”

Section: Remarksmentioning

confidence: 99%

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Magnetic excitation in resonant inelastic x-ray scattering ofSr2IrO4: A localized spin picture

Igarashi

Nagao

2014

Phys. Rev. B

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We study the magnetic excitations in 5d transition-metal oxide Sr 2 IrO 4 on the basis of the Heisenberg model with small anisotropic terms on a square lattice. We calculate the correlation functions by using the Green's functions in the spin-wave approximation. The spin waves are split into two modes with slightly different energies due to the anisotropic terms. It is shown that the spin correlation functions of the y and z components are composed of a single peak corresponding to each mode. We analyze the process of resonant inelastic x-ray scattering (RIXS) without relying on the fast-collision approximation to obtain the local scattering operator. The RIXS intensity is derived as a sum of the correlation functions of the y and z spin components. We demonstrate that the RIXS intensity as a function of energy shows a two-peak structure brought about by the two modes, which could be observed in the RIXS experiment.

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Section: B Excitation and Deexcitation Of Core Hole At A Single Sitesupporting

confidence: 63%

“…The coefficient D α (jm,σ ) describes the dependence on the 5d and core-hole states, which can be calculated in a similar manner to that explained in Ref. [25] for cuprates.…”

Section: A Second-order Optical Processmentioning

confidence: 96%

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Magnetic excitation in resonant inelastic x-ray scattering ofSr2IrO4: A localized spin picture

Igarashi

Nagao

2014

Phys. Rev. B

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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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“…The contribution of the twomagnon has been analyzed for insulating cuprates beyond the approximation. 29,30) …”

Section: L-edge 2p-3d Rixsmentioning

confidence: 99%

Inelastic X-ray Scattering Studies of Electronic Excitations

2013

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Inelastic x-ray scattering (IXS) has developed into one of the most powerful momentum-resolved spectroscopies. Especially in the last decade, it has achieved significant progress utilizing brilliant x-rays from third-generation synchrotron radiation facilities. Simultaneously, theoretical efforts have been made to predict or interpret the experimental spectra. One of the scientific fields studied intensively by IXS is strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties. IXS can provide a new insight into the electron dynamics of the systems through the observation of charge, spin, and orbital excitations. Focusing on the momentum-resolved electronic excitations in strongly correlated electron systems, we review IXS studies and the present capabilities of IXS for the study of the dynamics of materials. With nonresonant inelastic x-ray scattering (NIXS), one can directly obtain dynamical charge correlation and we discuss its complementary aspects with inelastic neutron scattering. NIXS also has a unique capability of measuring higher multipole transitions, which are usually forbidden in conventional optical absorption. Resonant inelastic x-ray scattering (RIXS) is now established as a valuable tool for measuring charge, spin, and orbital excitations in a momentum-resolved manner. We describe RIXS works on cuprates in detail and show what kind of electronic excitations have been observed. We also discuss RIXS studies on other transition-metal compounds. Finally, we conclude with an outlook on IXS using next-generation x-ray sources.

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Magnetic excitations inL-edge resonant inelastic x-ray scattering from cuprate compounds

Cited by 35 publications

References 47 publications

Magnetic excitation in resonant inelastic x-ray scattering ofSr2IrO4: A localized spin picture

Magnetic excitation in resonant inelastic x-ray scattering ofSr2IrO4: A localized spin picture

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

Inelastic X-ray Scattering Studies of Electronic Excitations

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