Evolution of magnetic surfboards and spin glass behavior in (Fe1- pGa p)2TiO5

Y Li; D Phelan; F Ye; H Zheng; E Krivyakina; A Samarakoon; P G LaBarre; J Neu; T Siegrist; S Rosenkranz; S V Syzranov; A P Ramirez

doi:10.1088/1361-648X/aceede

Evolution of magnetic surfboards and spin glass behavior in (Fe_{1- p}Ga _p)₂TiO₅

J Phys Condens Matter. 2023 Aug 29;35(47). doi: 10.1088/1361-648X/aceede.

Authors

Y Li¹, D Phelan¹, F Ye², H Zheng¹, E Krivyakina^{1

3}, A Samarakoon¹, P G LaBarre⁴, J Neu^{5

6}, T Siegrist^{5

7}, S Rosenkranz¹, S V Syzranov⁴, A P Ramirez⁴

Affiliations

¹ Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, United States of America.
² Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States of America.
³ Department of Physics, Northern Illinois University, DeKalb, IL 60115, United States of America.
⁴ Physics Department, University of California Santa Cruz, Santa Cruz, CA 95064, United States of America.
⁵ National High Magnetic Field Laboratory, Tallahassee, FL 32310, United States of America.
⁶ Nuclear Nonproliferation Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America.
⁷ Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, United States of America.

PMID: 37557895
DOI: 10.1088/1361-648X/aceede

Abstract

The unusual anisotropy of the spin glass (SG) transition in the pseudobrookite system Fe₂TiO₅has been interpreted as arising from an induced, van der Waals-like, interaction among magnetic clusters. Here we present susceptibility (χ) and specific heat data (C) for Fe₂TiO₅diluted with non-magnetic Ga, (Fe_1-pGa_p)₂TiO₅, for disorder parameterp= 0, 0.11, and 0.42, and elastic neutron scattering data forp= 0.20. A uniform suppression ofTgis observed upon increasingp, along with a value ofχTgthat increases asTgdecreases, i.e.dχ(Tg)/dTg<0We also observeCT∝T2in the low temperature limit. The observed behavior places (Fe_1-pGa_p)₂TiO₅in the category of a strongly geometrically frustrated SG.

Keywords: anisotropic spin glasses; geometric frustration; neutron scattering.