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Effect of iron vacancies on magnetic order and spin dynamics of the spin ladder BaFe2-δS1.5Se1.5

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4];  [1];  [5];  [6];  [1];  [1]
  1. Sun Yat-Sen Univ., Guangzhou (China)
  2. Brigham Young Univ., Provo, UT (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  6. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
Quasi-one-dimensional iron chalcogenides possess various magnetic states depending on the lattice distortion, electronic correlations, and presence of defects. Here 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.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Guangdong Basic and Applied Basic Research Foundation; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1872831
Alternate ID(s):
OSTI ID: 1900423
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
antiferromagnets
crystal structure
iron-based superconductors
spin dynamics