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Title: Doping effects of Cr on the physical properties of BaFe 1.9 - x Ni 0.1 Cr x As 2

Abstract

We present a systematic study on the heavily Cr doped iron pnictides BaFe1.9_xNi0.1CrxAs2 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 Neel 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 FeAs4 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.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); Chinese Academy of Sciences (CAS) - Strategic Priority Research Program; National Key Research and Development Program of China; Welch Foundation
OSTI Identifier:
1467651
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Gong, Dongliang, Xie, Tao, Zhang, Rui, Birk, Jonas, Niedermayer, Christof, Han, Fei, Lapidus, S. H., Dai, Pengcheng, Li, Shiliang, and Luo, Huiqian. Doping effects of Cr on the physical properties of BaFe1.9-xNi0.1CrxAs2. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.014512.
Gong, Dongliang, Xie, Tao, Zhang, Rui, Birk, Jonas, Niedermayer, Christof, Han, Fei, Lapidus, S. H., Dai, Pengcheng, Li, Shiliang, & Luo, Huiqian. Doping effects of Cr on the physical properties of BaFe1.9-xNi0.1CrxAs2. United States. doi:10.1103/PhysRevB.98.014512.
Gong, Dongliang, Xie, Tao, Zhang, Rui, Birk, Jonas, Niedermayer, Christof, Han, Fei, Lapidus, S. H., Dai, Pengcheng, Li, Shiliang, and Luo, Huiqian. Sun . "Doping effects of Cr on the physical properties of BaFe1.9-xNi0.1CrxAs2". United States. doi:10.1103/PhysRevB.98.014512.
@article{osti_1467651,
title = {Doping effects of Cr on the physical properties of BaFe1.9-xNi0.1CrxAs2},
author = {Gong, Dongliang and Xie, Tao and Zhang, Rui and Birk, Jonas and Niedermayer, Christof and Han, Fei and Lapidus, S. H. and Dai, Pengcheng and Li, Shiliang and Luo, Huiqian},
abstractNote = {We present a systematic study on the heavily Cr doped iron pnictides BaFe1.9_xNi0.1CrxAs2 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 Neel 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 FeAs4 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.},
doi = {10.1103/PhysRevB.98.014512},
journal = {Physical Review B},
issn = {2469-9950},
number = 1,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}