Inelastic light scattering in the spin cluster Mott insulator 
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Versteeg, R. B.; Boguschewski, C.; Becker, Petra; Loosdrecht, P.H.M. van

doi:10.1103/physrevb.100.224426

Cited by 5 publications

(2 citation statements)

References 42 publications

(78 reference statements)

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“…the Fano q-parameter decreases in modulus) above the magnetic transition temperature. Recently, an extensive Raman study of the spin excitations in the antiferromagnetic insulator Cu 2 OSeO 3 has been reported by Versteeg et al 32 This compound consists of structurally isolated Cu 4 spin units, which give rise to a multitude of intra-cluster spin excitations, which persist well above the Néel temperature T N , when the antiferromagnetic correlations between different clusters is lost. In the case of α−FeOOH the Fe-O1-Fe dimers are not isolated to such an extent as the Cu 4 clusters in Cu 2 OSeO 3 .…”

Section: R Is Thementioning

confidence: 99%

Raman spectroscopy of alpha-FeOOH (goethite) near antiferromagnetic to paramagnetic phase transition

Abrashev,

Ivanov,

Stefanov

et al. 2020

Preprint

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Synthetic powder, ore samples and mineral single crystals of goethite (α−FeOOH) were investigated with polarized Raman spectroscopy at temperatures from 300 K to 473 K. The symmetry of the vibrational modes, observed in different scattering configurations, was determined unequivocally. The assignment of the Raman-active modes to definite atomic vibrations is supported by two types of lattice-dynamical calculations: empirical shell-model and ab initio DFT. The temperature dependencies of the lineshape parameters of some Raman-active vibrations near to the antiferromagneticparamagnetic phase transition infers for a significant spin-lattice coupling in this compound. The most informative in this aspect is the B 3g phonon at 387 cm −1 , which overlays a broad scattering background and displays a pronounced asymmetric Fano-lineshape. The asymmetry increases in the paramagnetic state above the Neel temperature (T N = 393 K) indicating a strong interaction of this mode with the underlying excitation continuum. The origin of the excitation background is discussed in light of our experimental results and the existing data for the magnetic structure and transport properties of α−FeOOH. We rationalize that, most probably, the background stems from magnetic excitations, and the asymmetric shape of the B 3g phonon is a result of a linear spin-phonon coupling of this mode with the Fe-O1-Fe spin dimers. Another mechanism, a phonon interaction with thermally activated charge carriers above above T N , is also considered.

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Section: R Is Thementioning

confidence: 99%

Raman spectroscopy of alpha-FeOOH (goethite) near antiferromagnetic to paramagnetic phase transition

Abrashev,

Ivanov,

Stefanov

et al. 2020

Preprint

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“…As most experimental works focused so far on site-averaged magnetic properties of Cu 2 OSeO 3 13,15,18,19 , the site-specific magnetic response and the local electronic structure of the Cu 3d valence states remain marginally understood 20,21 . Nonetheless, the latter is fundamentally related to the DM interactions -responsible for the helical order and the skyrmion formation 22 -as they are explained through multi-orbital and multi-site hopping paths, involving both Cu-I and Cu-II.…”

Section: Introductionmentioning

confidence: 99%

Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$

Gu,

Wang,

Lin

et al. 2022

Preprint

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The manifestation of skyrmions in the Mott-insulator Cu 2 OSeO 3 originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competing interactions is a challenging task due the complexity of this system. Here we combine X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering to uncover the electronic and magnetic excitations of Cu 2 OSeO 3 with site-specificity. We quantify the energies of the 3d crystal-field splitting for both Cu-I and Cu-II, fundamental to optimize model Hamiltonians. Additionally, we unveil a site-specific magnetic mode, indicating that individual spin character is preserved within the entangled-tetrahedron picture.Our results thus provide experimental constraint for validating theories that describe the interactions of Cu 2 OSeO 3 , highlighting the site-selective capabilities of resonant spectroscopies.

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Experimental signatures of quantum and topological states in frustrated magnetism

Khatua,

Sana,

Zorko

et al. 2023

Physics Reports

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Inelastic light scattering in the spin cluster Mott insulator Cu2OSeO3

Cited by 5 publications

References 42 publications

Raman spectroscopy of alpha-FeOOH (goethite) near antiferromagnetic to paramagnetic phase transition

Raman spectroscopy of alpha-FeOOH (goethite) near antiferromagnetic to paramagnetic phase transition

Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$

Experimental signatures of quantum and topological states in frustrated magnetism

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