Spinel-type frustrated system studied by neutron scattering and magnetization measurements

Suzuki, Hiroyuki; Tsunoda, Yorihiko

doi:10.1016/j.jpcs.2007.08.028

Cited by 18 publications

(28 citation statements)

References 12 publications

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“…3 , spin S = 3/2, no orbital degree of freedom] is known to undergo non-frustrated hexamer-type spin fluctuations so as to avoid frustration. 5,[11][12][13] The Cr sites form a corner-sharing tetrahedral lattice called a pyrochlore lattice, in which kagome and triangle planes stack alternately along the [111] direction. The hexamers are formed on the kagome plane.…”

Section: Introductionmentioning

confidence: 99%

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄

Tomiyasu

Kamazawa

2011

J. Phys. Soc. Jpn.

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We analyzed the single-crystal neutron scattering data on a frustrated spinel ZnFe 2 O 4 , which is governed by dominant antiferromagnetic third-neighbor exchange interactions J 3 and additional ferromagnetic J 1 [K. Kamazawa et al.: Phys. Rev. B 68 (2003) 024412]. A spin dodecamer model that is formed on the kagome plane is proposed. It is notable that, although J 3 bonds consist of two types of exchange paths Fe-O-Fe-O-Fe and Fe-O-Zn-O-Fe, only the spatial spin correlations corresponding to the former paths are antiferromagnetic while those of all the latter paths are ferromagnetic in the dodecamer. This fact suggests that the frustration is relieved by utilizing the difference of exchange paths even in the same-distant interactions, that is to say, that only specific orbital mixing is selectively enhanced as an origin of the spin molecule.

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Section: Introductionmentioning

confidence: 99%

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄

Tomiyasu

Kamazawa

2011

J. Phys. Soc. Jpn.

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“…Therefore, magnetic quasielastic scattering in the paramagnetic phases was intensively studied by neutron scattering in spinel, pyrochlore, kagome, triangular systems, and so on. As a result, characteristic spatial correlations of spins were found, such as a small six-spin cluster [3][4][5][6][7][8], a large six-spin cluster [9], a seven-spin cluster [10], spin ice [11,12], and short-range order with propagation vector(s) [13,14].…”

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confidence: 99%

Molecular Spin Resonance in the Geometrically Frustrated MagnetMgCr2O4by Inelastic Neutron Scattering

et al. 2008

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We measured two magnetic modes with finite and discrete energies in an antiferromagnetic ordered phase of a geometrically frustrated magnet MgCr2O4 by single-crystal inelastic neutron scattering, and clarified the spatial spin correlations of the two levels: one is an antiferromagnetic hexamer and the other is an antiferromagnetic heptamer. Since these correlation types are emblematic of quasielastic scattering with geometric frustration, our results indicate instantaneous suppression of lattice distortion in an ordered phase by spin-lattice coupling, probably also supported by orbital and charge. The common features in the two levels, intermolecular independence and discreteness of energy, suggest that the spin molecules are interpreted as quasiparticles (elementary excitations with energy quantum) of highly frustrated spins, in analogy with the Fermi liquid approximation.

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“…2(b)]. 5,[9][10][11] The magnetic ions Cr 3+ [(t 2g ) 3 , spin S = 3/2] form a corner-sharing tetrahedral lattice called a pyrochlore lattice; such a lattice has kagome and triangle planes stacked alternately along the [111] direction and is geometrically frustrated.…”

Section: Introductionmentioning

confidence: 99%

Molecular spin-liquid state in the spin-32frustrated spinel HgCr2O4

et al. 2011

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A hexamer-type spin excitation seen in spinel chromates ACr 2 O 4 (A = Mg, Zn, or Cd) is the representative spin-liquid-like state caused by geometrical frustration. To clarify an origin of the state, we comparatively studied spin excitations in an isomorphic material HgCr 2 O 4 by inelastic neutron scattering and observed a different molecular-type excitation. Numerical analyses performed using model Hamiltonians suggest that these two types of spin excitations originate from a spin-3/2 molecular singlet hidden in a magnetically ordered phase. The difference between the molecular types is explained by the difference in the kind of exchange interactions occurring in the chromates.

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Spinel-type frustrated system studied by neutron scattering and magnetization measurements

Cited by 18 publications

References 12 publications

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄

Molecular Spin Resonance in the Geometrically Frustrated MagnetMgCr2O4by Inelastic Neutron Scattering

Molecular spin-liquid state in the spin-32frustrated spinel HgCr2O4

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Spinel-type frustrated system studied by neutron scattering and magnetization measurements

Cited by 18 publications

References 12 publications

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe2O4

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe2O4

Molecular Spin Resonance in the Geometrically Frustrated MagnetMgCr2O4by Inelastic Neutron Scattering

Molecular spin-liquid state in the spin-32frustrated spinel HgCr2O4

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A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄

A Spin Molecule Model for Geometrically Frustrated Spinel ZnFe₂O₄