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Local atomic and magnetic structure of multiferroic (Sr,Ba)⁢(Mn,Ti)⁢O3

Journal Article · · Physical Review. B
 [1];  [1];  [2];  [3];  [4];  [2];  [1]
  1. Brigham Young University, Provo, UT (United States)
  2. Northern Illinois University, DeKalb, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division
  3. Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Here, we present a detailed study of the local atomic and magnetic structure of the type-I multiferroic perovskite system (Sr,Ba)(Mn,Ti)O3 using x-ray and neutron pair distribution function (PDF) analysis, polarized neutron scattering, and muon spin relaxation (μSR) techniques. The atomic PDF analysis reveals widespread nanoscale tetragonal distortions of the crystal structure even in the paraelectric phase with average cubic symmetry, corresponding to incipient ferroelectricity in the local structure. Magnetic PDF analysis, polarized neutron scattering, and μSR likewise confirm the presence of short-range antiferromagnetic correlations in the paramagnetic state, which grow in magnitude as the temperature approaches the magnetic transition. We show that these short-range magnetic correlations coincide with a reduction of the tetragonal (i.e., ferroelectric) distortion in the average structure, suggesting that short-range magnetism can play an important role in magnetoelectric and/or magnetostructural phenomena even without genuine long-range magnetic order. The reduction of the tetragonal distortion scales linearly with the local magnetic order parameter, pointing to spontaneous linear magnetoelectric coupling in this system. These findings provide greater insight into the multiferroic properties of (Sr,Ba)(Mn,Ti)O3 and demonstrate the importance of investigating the local atomic and magnetic structure to gain a deeper understanding of the intertwined degrees of freedom in multiferroics.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725; SC0012704; SC0021134
OSTI ID:
2333756
Alternate ID(s):
OSTI ID: 2474559
OSTI ID: 2477763
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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