Spectrum splitting of bimagnon excitations in a spatially frustrated Heisenberg antiferromagnet revealed by resonant inelastic x-ray scattering

Luo, Cheng; Datta, Trinanjan; Yao, Dao‐Xin

doi:10.1103/physrevb.89.165103

Cited by 9 publications

(25 citation statements)

References 60 publications

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“…Nevertheless, they correspond to visible spectral features, and using the assignments of previous works as guide this allows us to make the following tentative assignments: the elastic peak at 0 eV, a possible single phonon mode at 116 meV (not reported in previous literature), a single-magnon mode at 230-246 meV (higher value out-of-plane) and multi-magnon modes at above 320 meV. This can be compared with similar values of Sr2CuO2Cl2, where one-, two, and three-magnon contributions have been predicted around 300-400 meV [26] [27]. The higher energy and frequency of the single-magnon mode along the c-axis is due to a longer bond length between the Cu(1)O-chain orbitals compared to the in-plane Cu(2,3)O2-plane orbitals in the basal ab-plane.…”

Section: 2supporting

confidence: 81%

Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K -edges of YBa 2 Cu 3 O 7-x

Magnuson

Schmitt

Duda

2018

Journal of Electron Spectroscopy and Related Phenomena

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We present a study on the high-Tc superconductor (HTSC) YBa2Cu3O7-x (YBCO) using polarization-dependent X-ray absorption and resonant inelastic X-ray scattering. High-resolution measurements using synchrotron-radiation are compared with calculations using a quasi-atomic multiplet approach performed at the Cu 2p3/2-edge of YBCO. We use a multiplet approach within the single impurity Anderson model to reproduce and understand the character of the localized low-energy excitations in YBCO. We observe a distinct peak at about 0.5 eV in O K RIXS. This peak shows dependence on doping, incident energy, and momentum transfer that suggests that it has a different origin than the previously discussed cuprate bi-magnons. Therefore, we assign it to multi-magnon excitations between the Zhang Rice bands and/or the Upper Hubbard bands, respectively.

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Section: 2supporting

confidence: 81%

Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K -edges of YBa 2 Cu 3 O 7-x

Magnuson

Schmitt

Duda

2018

Journal of Electron Spectroscopy and Related Phenomena

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“…In contrast to the square lattice models where the spectrum is known to vanish at the magnetic ordering wave vector, in the BCAF system the RIXS intensity is non-zero at (π/2, −π/2). But, similar to the Heisenberg square lattice indirect K-edge RIXS spectrum we find that the intensity is zero at q = (0, 0) [29,31,34]. Away from the Brillouin zone edge the X-ray spectrum starts to develop non-zero contributions from the four different momentum channels.…”

Section: A Rixs Intensity Spectrumsupporting

confidence: 70%

“…The other two, M 12 and M 21 ,are the interband channels. Typically, the RIXS operator for one magnon band systems such as the J 1 -J 2 Heisenberg model has a 2 × 2 matrix form [34]. However, for this multiband problem it is a 4 × 4 matrix.…”

Section: B Indirect Rixs Processmentioning

confidence: 99%

“…The presence of multi-magnon excitations could be potentially be probed via resonant inelastic X-ray scattering (RIXS) spectroscopy. Current experimental [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], theoretical [29][30][31][32][33][34][35][36][37][38][39], and computational studies [26,33,38,[40][41][42] on RIXS suggest the possibility to explore quantum magnets and correlated systems from various perspectives.…”

Section: Introductionmentioning

confidence: 99%

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Indirect K-edge bimagnon resonant inelastic x-ray scattering spectrum ofα-FeTe

Huang¹,

Mongan²,

Datta³

et al. 2017

J. Phys.: Condens. Matter

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We calculate the K-edge indirect bimagnon resonant inelastic x-ray scattering (RIXS) intensity spectra of the bicollinear antiferromagnetic order known to occur in the α-FeTe chalcogenide system. Utilizing linear spin wave theory for this large-S spin system we find that the bimagnon spectrum contains four scattering channels (two intraband and two interband). We find from our calculations that for suitable energy-momentum combination the RIXS spectra can exhibit a one-, two-or three-peak structure. The number of peaks provides a clue on the various bimagnon excitation processes that can be supported both in and within the acoustic and optical magnon branches of the bicollinear antiferromagnet. Unlike the RIXS response of the antiferromagnetic or the collinear antiferromagnetic spin ordering, the RIXS intensity spectrum of the bicollinear antiferromagnet does not vanish at the magnetic ordering wave vector (π/2, −π/2). It is also sensitive to next-next nearest neighbor and biquadratic coupling interactions. Our predicted RIXS spectrum can be utilized to understand the role of multi-channel bimagnon spin excitations present in the α-FeTe chalcogenide. PACS number(s): 78.70. Ck, 75.10.Jm

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“…The Green's function G(q, ω) consists of a bimagnon part G bm (q, ω) and a magnon-phonon-magnon part G m-ph-m (q, ω). The bimagnon part is given by [21,24]…”

Section: Bimagnon and Magnon-phonon Rixsmentioning

confidence: 99%

Magnon-phonon coupling effects on the indirect K -edge resonant inelastic x-ray scattering spectrum of a two-dimensional Heisenberg antiferromagnet

et al. 2017

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We compute the effects of magnon-phonon coupling on the indirect K-edge bimagnon resonant inelastic x-ray scattering (RIXS) intensity spectrum of a square lattice Heisenberg antiferromagnet. We analyze the effects of competing nearest and next-nearest magnetic and magnon-phonon coupling interaction in the RIXS spectrum, for both the antiferromagnetic (AF) and the collinear antiferromagnetic (CAF) phases of the model. Utilizing the Dyson-Maleev representation of spin operators, the Bethe-Salpeter ladder approximation scheme for the bimagnon interacting channel, and considering the lowest order magnon-phonon-magnon scattering interaction we highlight distinct features in the X-ray spectrum. Considering damping effects, arising due to the presence of phonons, we find that in the AF phase the RIXS intensity spectrum attains a maximum value primarily localized around the K ± π 2 , ± π 2 -point. For the CAF phase the intensity is broadly distributed with a significant scattering intensity located around the Y ± π 2 , 0 -point. Furthermore, in the CAF phase for suitable anisotropy, nearest-, and next-nearest neighbor interaction parameters the phonon effects can manifest itself as a distinct peak both below and above the bimagnon peak. Such a feature is in contrast to the antiferromagnetic spectrum where the effect due to the phonon peak was located consistently beyond the bimagnon peak in the high energy end of the spectrum. Additionally, in the CAF phase we find the RIXS bimagnon-phonon spectrum to be more sensitive to anisotropy compared to its antiferromagnetic counterpart. We conclude that the ultimate effect of magnon-phonon effects in the indirect K-edge RIXS spectrum, in both the antiferromagnetic and the collinear antiferromagnetic phase, is an observable effect. PACS number(s): 78.70.Ck, 75.25.-j, 75.10.Jm cal vibrations) affect the magnetic RIXS spectrum? How can a multimagnon RIXS excitation spectrum, such as that of a bimagnon, be affected by phonons? The interplay of phonons with bimagnons offer the potential to uncover physical phenomena which has been overlooked till date. With next generation beamlines being constructed globally and experimental initiatives likely to probe phonon effects in correlated materials, answers to the above questions are imperative and timely. The theoretical study in this article offers insight on the key experimentally observable signatures which delineate magnon-magnon and magnon-phonon interaction effects in the indirect K-edge RIXS spectrum.Past investigation on spatial anisotropy and significant frustration within the square lattice Heisenberg magnet has led to the prediction of a two-peak bimagnon structure [24]. The proposed two-peak structure was a consequence of the bimagnon spectrum's sensitivity to microscopic magnetic interactions. But, in real materials lattice vibrations do matter. Thus, a realistic theoretical model which provides a true depiction of the materials under investigation with a comprehensive account of magnon-phonon coupling is called for.The coupli...

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Spectrum splitting of bimagnon excitations in a spatially frustrated Heisenberg antiferromagnet revealed by resonant inelastic x-ray scattering

Cited by 9 publications

References 60 publications

Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K -edges of YBa 2 Cu 3 O 7-x

Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K -edges of YBa 2 Cu 3 O 7-x

Indirect K-edge bimagnon resonant inelastic x-ray scattering spectrum ofα-FeTe

Magnon-phonon coupling effects on the indirect K -edge resonant inelastic x-ray scattering spectrum of a two-dimensional Heisenberg antiferromagnet

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