Magnetic and Structural Properties of the Iron Oxychalcogenides La₂O₂Fe₂OM₂ (M = S, Se)

Journal Article · 31 December 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.024109 · OSTI ID:1466721

Freelon, B.; Yamani, Z.; Swainson, Ian; Flacau, R.; Karki, B.; Liu, Yu Hao; Craco, L.; Laad, M. S.; Wang, Meng; Chen, Jiaqi; Birgeneau, R. J.; Fang, Minghu

In this paper, we present the results of structural and magnetic phase comparisons of the iron oxychalcogenides La₂O₂Fe₂OM₂ (M = S, Se). Elastic neutron scattering reveals that $$M$$ = S and Se have similar nuclear structures at room and low temperatures. Both materials obtain antiferromagnetic ordering at a Neel temperature $$T_{N}$$ 90.1 $$\pm$$ 0.16 K and 107.2 $$\pm$$ 0.06 K for $$M$$ = Se and S, respectively. The magnetic arrangements of $$M$$ = S, Se are obtained through Rietveld refinement and we present the first direct comparison of magnetic structural analysis for these materials. We find the order parameter exponent $$\beta$$ to be 0.129 $$\pm$$ 0.006 for $$M$$ = Se and 0.133 $$\pm$$ 0.007 for $$M$$ = S. Each of these values is near the Ising symmetry value of 1/8. Lastly, this suggests that although lattice and electronic structural modifications result from chalcogen exchange, the nature of the magnetic interactions is similar in these materials.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1466721
• Alternate ID(s): OSTI ID: 1491946
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English