FeTi$_2$O$_5$: a spin Jahn-Teller transition tuned by cation substitution

Journal article

We have used muon-spin rotation, heat capacity and x-ray diffraction measurements in combination with density functional theory and dipole field calculations to investigate the crystal and magnetic structure of FeTi$_2$O$_5$. We observe a long range ordered state below 41.8(5) K with indications of significant correlations existing above this temperature. We determine candidate muon stopping sites in this compound, and find that our data are consistent with the spin Jahn-Teller driven antiferromagnetic ground state with k=(1/2,1/2,0) reported for CoTi$_2$O$_5$. By comparing our data with calculated dipolar fields we can restrict the possible moment size and directions of the Fe$^{2+}$ ions.

Authors: Lang, F; Jowitt, L; Prabhakaran, D; Johnson, R; Blundell, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review B
• Volume: 100
• Article number: 094401
• Publication date: 2019-09-03
• Acceptance date: 2019-08-12
• DOI: 10.1103/PhysRevB.100.094401
• EISSN: 2469-9969
• ISSN: 2469-9950