Doping effects of Cr on the physical properties of BaFe1.9−x Ni0.1 Crx As2
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PhysRevB.98.014512.pdf
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1.3 MB
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Author(s)
Gong, Dongliang
Xie, Tao
Zhang, Rui
Birk, Jonas
Niedermayer, Christof
Han, Fei
Lapidus, S. H.
Dai, Pengcheng
Li, Shiliang
Luo, Huiqian
Date Issued
July 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Gong, Dongliang, Tao Xie, Rui Zhang, Jonas Birk, Christof Niedermayer, Fei Han, S. H. Lapidus, Pengcheng Dai, Shiliang Li, and Huiqian Luo. "Doping effects of Cr on the physical properties of BaFe1.9−x Ni0.1 Crx As2."Physical REview B 98 (2018), 014512.
Version
Final published version
Abstract
We present a systematic study on the heavily Cr doped iron pnictides BaFe_{1.9−x}Ni_{0.1}Cr_{x}As_{2} by using elastic neutron scattering, high-resolution synchrotron x-ray diffraction (XRD), resistivity, and Hall transport measurements. When the Cr concentration increases from x=0 to 0.8, neutron diffraction experiments suggest that the collinear antiferromagnetism persists in the whole doping range, where the Néel temperature T_{N} coincides with the tetragonal-to-orthorhombic structural transition temperature T_{s}, and both of them keeps around 35 K. The magnetic ordered moment, on the other hand, increases within increasing x until x=0.5, and then decreases with further increasing x. Detailed refinement of the powder XRD patterns reveals that the Cr substitutions actually stretch the FeAs_{4} tetrahedron along the c axis and lift the arsenic height away from the Fe-Fe plane. Transport results indicate that the charge carriers become more localized upon Cr doping, then changes from electron type to hole type around x=0.5. Our results suggest that the ordered moment and the ordered temperature of static magnetism in iron pnictides can be decoupled and tuned separately by chemical doping.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.014512
