Optical Techniques for Systems with Competing Interactions

Lemmens, P.

doi:10.1007/978-3-642-10589-0_5

Cited by 2 publications

(2 citation statements)

References 109 publications

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“…In this paper, we present inelastic light scattering (Raman scattering) experiments on powder samples of volborthite and vesignieite. Apart from differentiating ground states with weak order or local order parameters [10,11], Raman scattering is also a sensitive probe of lattice and electronic/magnetic degrees of freedom [28]. Recently, it has been successfully applied to characterize the excitation spectrum of the spin liquid state in herbertsmithite [29], as well as to determine the stoichiometry of zinc paratacamite powder samples [30].…”

Section: Introductionmentioning

confidence: 99%

The spin dynamics in distorted kagome lattices: a comparative Raman study

Wulferding

Lemmens

Yoshida

et al. 2012

J. Phys.: Condens. Matter

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Despite the conceptional importance of realizing spin liquids in solid states only few compounds are known. On the other hand the effect of lattice distortions and anisotropies on the magnetic exchange topology and the fluctuation spectrum is an interesting problem. We compare the excitation spectra of the two s = 1/2 kagome lattice compounds, volborthite and vesignieite, using Raman scattering. We demonstrate that even small modifications of the crystal structure may have a huge effect on the phonon spectrum and low-temperature properties.

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Section: Introductionmentioning

confidence: 99%

The spin dynamics in distorted kagome lattices: a comparative Raman study

Wulferding

Lemmens

Yoshida

et al. 2012

J. Phys.: Condens. Matter

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“…In fact, inelastic light scattering takes advantage of the fact that the response is in essence linked to many-body physics and that the photon polarization enables to collect valuable insights on correlated electron systems. 13,14 Following this route, we present here inelastic light scattering as a natural probe to characterize the order and the low-energy excitations in spin S = 1 models.…”

Section: Introductionmentioning

confidence: 99%

Theory of inelastic light scattering in spin-1 systems: Resonant regimes and detection of quadrupolar order

2011

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Motivated by the lack of an obvious spectroscopic probe to investigate non-conventional order such as quadrupolar orders in spin S > 1 2 systems, we present a theoretical approach to inelastic light scattering for spin-1 quantum magnets in the context of a two-band Hubbard model. In contrast to the S = 1 2 case, where the only type of local excited state is a doubly occupied state of energy U , several local excited states with occupation up to 4 electrons are present. As a consequence, we show that two distinct resonating scattering regimes can be accessed depending on the incident photon energy. For ωin U , the standard Loudon-Fleury operator remains the leading term of the expansion as in the spin-1 2 case. For ωin 4U , a second resonant regime is found with a leading term that takes the form of a biquadratic coupling ∼ (Si · Sj)2 . Consequences for the Raman spectra of S=1 magnets with magnetic or quadrupolar order are discussed. Raman scattering appears to be a powerful probe of quadrupolar order.

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Optical Techniques for Systems with Competing Interactions

Cited by 2 publications

References 109 publications

The spin dynamics in distorted kagome lattices: a comparative Raman study

The spin dynamics in distorted kagome lattices: a comparative Raman study

Theory of inelastic light scattering in spin-1 systems: Resonant regimes and detection of quadrupolar order

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