Effect of iron vacancies on magnetic order and spin dynamics of the spin ladder BaFe2-δ S1.5 Se1.5

Zengjia Liu, Xiao Sheng Ni, Lisi Li, Hualei Sun, Feixiang Liang, Benjamin A. Frandsen, Andrew D. Christianson, Clarina Dela Cruz, Zhijun Xu, Dao Xin Yao, Jeffrey W. Lynn, Robert J. Birgeneau, Kun Cao, Meng Wang

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4 Scopus citations

Abstract

Quasi-one-dimensional iron chalcogenides possess various magnetic states depending on the lattice distortion, electronic correlations, and presence of defects. We present neutron diffraction and inelastic neutron scattering experiments on the spin ladder compound BaFe2-δS1.5Se1.5 with ∼6% iron vacancies. The data reveal that long-range magnetic order is absent, while the characteristic magnetic excitations that correspond to both the stripe- and block-type antiferromagnetic correlations are observed. First-principles calculations support the existence of both stripe- and block-type antiferromagnetic short-range orders in the experimental sample. The disappearance of long-range magnetic order may be due to the competition between these two magnetic orders, which is greatly enhanced for a certain concentration of iron vacancies, which we calculate to be about 6%, consistent with the measured iron vacancy concentration. Our results highlight how iron vacancies in the iron-based spin ladder system strongly influence the magnetic ground state.

Original languageEnglish
Article number214303
JournalPhysical Review B
Volume105
Issue number21
DOIs
StatePublished - Jun 1 2022

Funding

Work at Sun Yat-Sen University was supported by the National Natural Science Foundation of China (Grants No. 11904414, No. 12174454, No. 11904416, and No. 11974432), the Guangdong Basic and Applied Basic Research Foundation (Grants No. 2021B1515120015 and No. 2019A1515011337), and the National Key Research and Development Program of China (Grants No. 2019YFA0705702, No. 2018YFA0306001, and No. 2017YFA0206203). Work at the University of California, Berkeley, and Lawrence Berkeley National Laboratory was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202) and the Office of Basic Energy Sciences. A.D.C. was partially supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. The experiment at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.

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