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Magnetic ordering in the pyrochlore Ho2CrSbO7 determined from neutron diffraction, and the magnetic properties of other RE2CrSbO7 phases (RE=Y, Tb, Dy, Er)

Whitaker, Mariana J. ; Greaves, Colin

Journal of solid state chemistry, 2014-07, Vol.215, p.171-175 [Periódico revisado por pares]

Amsterdam: Elsevier Inc

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Título:
Magnetic ordering in the pyrochlore Ho2CrSbO7 determined from neutron diffraction, and the magnetic properties of other RE2CrSbO7 phases (RE=Y, Tb, Dy, Er)
Autor: Whitaker, Mariana J. ; Greaves, Colin
Assuntos: Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Exact sciences and technology ; Holmium ; Magnetic properties and materials ; Magnetic structure ; Neutron diffraction ; Neutron diffraction and scattering ; Other ferromagnetic metals and alloys ; Physics ; Pyrochlore ; Single-crystal and powder diffraction ; Spin-ice ; Structure of solids and liquids; crystallography ; Studies of specific magnetic materials
É parte de: Journal of solid state chemistry, 2014-07, Vol.215, p.171-175
Descrição: The magnetic structure of the pyrochlore Ho2CrSbO7, which orders magnetically below 13K, has been studied using neutron powder diffraction. Ho2CrSbO7 is found to form an “ordered spin-ice structure” where the magnetic moments are constrained along the 111 axes, but with a ferromagnetic moment in one direction. The Cr3+ ions order ferromagnetically and this is thought to lift the degeneracy of the x, y and z directions in the cubic structure causing the ferromagnetic component from the Ho3+ ions to align. The pyrochlores RE2CrSbO7 where RE=Y, Tb, Dy and Er have also been prepared and studied using SQUID magnetometry. The Ho magnetic moments align to provide an overall ferromagnetic moment along [001]. [Display omitted] •Despite having inherent frustration on the Ho sublattice, Ho2CrSbO7 orders ferromagnetically below 13K.•Ordering on the Cr/Sb sublattice appears to remove the degenerate ground state for the Ho order.•The Ho3+ magnetic moments are aligned along directions by crystal field effects.•Y2CrSbO7 with diamagnetic Y3+ ions also has a ferromagnetic ground state.
Editor: Amsterdam: Elsevier Inc
Idioma: Inglês

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Magnetic ordering in the pyrochlore Ho2CrSbO7 determined from neutron diffraction, and the magnetic properties of other RE2CrSbO7 phases (RE=Y, Tb, Dy, Er)

Whitaker, Mariana J. ; Greaves, Colin

Amsterdam: Elsevier Inc

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