Mn-induced Ferromagnetic Semiconducting Behavior with Linear Negative Magnetoresistance in Sr4(Ru1-xMnx)3O10 Single Crystals
[3];
[4];
[4];
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Triple-layered Sr4Ru3O10 is a unique ferromagnet with the central RuO6 layer behaving differently from two outer layers both crystallographically and magnetically. Here, we report that the partial substitution of Ru by smaller Mn gives rise to modification in crystal structure, electronic and magnetic properties of Sr4(Ru1-xMnx)3O10. Through the single crystal X-ray diffraction refinement, we find that (Ru/Mn)O6 octahedral rotation is no longer detectable at x ≥ 0.23, leading to the tetragonal structure. The magnetization measurements indicate the ferromagnetic transition temperature TC decreases from 105 K for x = 0 to 30 K for x = 0.41, with the reduced magnetic moment as well. Remarkably, Mn doping results in the change of magnetic anisotropy from the easy c axis in x = 0 to the easy ab plane seen in x = 0.34 and 0.41. Such change also removes the ab-plane metamagnetic transition observed in x = 0. Furthermore, the electrical resistivity increases with increasing x showing semiconducting behavior with Δ ~ 10 meV for x = 0.34 and 30 meV for x = 0.41. Under applied magnetic field, the magnetoresistance exhibits negative and linear field dependence in all current and field configurations. These results clearly indicate Sr4(Ru1-xMnx)3O10 is a novel ferromagnetic semiconductor with exotic magnetotransport properties.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Board of Regents State of Louisiana Research Competitiveness Subprogram (RCS)
- Grant/Contract Number:
- AC05-00OR22725; SC0016315; LEQSF(2017-20)-RD-A-08
- OSTI ID:
- 1474446
- Journal Information:
- Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | November 2019 |
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