Neutron scattering study of fluctuating and static spin correlations in the anisotropic spin glass Fe2TiO5

Li, Yu; LaBarre, P. G.; Pajerowski, D. M.; Ramirez, A. P.; Rosenkranz, S.; Phelan, D.

doi:10.1103/physrevb.107.014405

Neutron scattering study of fluctuating and static spin correlations in the anisotropic spin glass Fe2 Ti O5

Journal Article · Sun Jan 08 23:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.014405· OSTI ID:1969282

^[1]; ^[2]; Pajerowski, D. M. ^[3]; ^[2]; ^[1]; Phelan, D. ^[1]

Argonne National Lab. (ANL), Lemont, IL (United States). Materials Science Division
Univ. of California, Santa Cruz, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

The anisotropic spin-glass transition, in which spin freezing is observed only along the c axis in pseudobrookite Fe₂TiO₅, has long been perplexing because the Fe³⁺ moments (d⁵) are expected to be isotropic. Recently, neutron diffraction demonstrated that surfboard-shaped antiferromagnetic nanoregions coalesce above the glass transition temperature T_g≈55K, and a model was proposed in which the freezing of the surfboard magnetization fluctuations leads to the anisotropic spin-glass state. Given this model, we have carried out high-resolution inelastic neutron scattering measurements of the spin-spin correlations to understand the temperature dependence of the intrasurfboard spin dynamics on neutron (picosecond) timescales. Here, in this paper, we report on the temperature-dependence of the spin fluctuations measured from single-crystal Fe₂TiO₅. Strong quasi-elastic magnetic scattering, arising from intrasurfboard correlations, is observed well above T_g. The spin fluctuations possess a steep energy–wave vector relation and are indicative of strong exchange interactions, consistent with the large Curie-Weiss temperature. As the temperature approaches T_g from above, a shift in spectral weight from inelastic to elastic scattering is observed. At various temperatures between 4 and 300 K, a characteristic relaxation rate of the fluctuations is determined. Despite the freezing of most of the spin correlations, an inelastic contribution remains even at base temperature, signifying the presence of fluctuating intrasurfboard spin correlations to at least T/T_g≈0.1 , consistent with an energy landscape that is a hybrid between conventional and geometrically frustrated spin glasses.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; SC0017862

OSTI ID:: 1969282

Alternate ID(s):: OSTI ID: 1908279

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 1 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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spin fluctuations
spin glasses

Neutron scattering study of fluctuating and static spin correlations in the anisotropic spin glass Fe2 Ti O5

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