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Type: Artigo de periódico
Title: High-resolution Neutron Scattering Study Of Tb2 Mo2 O7: A Geometrically Frustrated Spin Glass
Author: Ehlers G.
Greedan J.E.
Stewart J.R.
Rule K.C.
Fouquet P.
Cornelius A.L.
Adriano C.
Pagliuso P.G.
Qiu Y.
Gardner J.S.
Abstract: The low-temperature magnetic properties of Tb2 Mo2 O7 have been studied with bulk susceptibility measurements and with elastic and high-resolution inelastic neutron scattering. This system is a spin glass with a freezing temperature Tg ∼25 K. A reverse Monte Carlo simulation of the neutron diffraction data shows weak ferromagnetic near-neighbor spatial correlations that do not extend beyond 10 Å. Neutron measurements of the spin dynamics reveal a slowing down with decreasing temperature without an anomaly at the glass transition. A low-lying Q -independent mode is seen at ω0 ∼0.28 meV. This dispersionless crystal electric field transition is measurable up to 60 K. © 2010 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.81.224405
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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