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Title: Synthesis and characterization of Ca-doped LaMnAsO

Abstract

Here, we report on our attempt to hole-dope the antiferromagnetic semiconductor LaMnAsO by substitution of the La 3+ site by Ca 2+. We use neutron and x-ray diffraction, magnetic susceptibility, and transport techniques to characterize polycrystalline (La 1–xCa x)MnAsO samples prepared by solid-state reaction and find that the parent compound is highly resistant to substitution with an upper limit x ≤ 0.01. Magnetic susceptibility of the parent and the x = 0.002(x nom = 0.04) compounds indicate a negligible presence of magnetic impurities (i.e., MnO or MnAs). Rietveld analysis of neutron and x-ray diffraction data shows the preservation of both the tetragonal (P4/nmm) structure upon doping and the antiferromagnetic ordering temperature, T N = 355 ± 5 K.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Univ. of Missouri, Columbia, MO (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1441003
Alternate Identifier(s):
OSTI ID: 1437677
Report Number(s):
IS-J-9679
Journal ID: ISSN 2475-9953; PRMHAR; TRN: US1900862
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 5; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Liu, Yong, Straszheim, Warren E., Das, Pinaki, Islam, Farhan, Heitmann, Thomas W., McQueeney, Robert J., and Vaknin, David. Synthesis and characterization of Ca-doped LaMnAsO. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.054410.
Liu, Yong, Straszheim, Warren E., Das, Pinaki, Islam, Farhan, Heitmann, Thomas W., McQueeney, Robert J., & Vaknin, David. Synthesis and characterization of Ca-doped LaMnAsO. United States. doi:10.1103/PhysRevMaterials.2.054410.
Liu, Yong, Straszheim, Warren E., Das, Pinaki, Islam, Farhan, Heitmann, Thomas W., McQueeney, Robert J., and Vaknin, David. Fri . "Synthesis and characterization of Ca-doped LaMnAsO". United States. doi:10.1103/PhysRevMaterials.2.054410. https://www.osti.gov/servlets/purl/1441003.
@article{osti_1441003,
title = {Synthesis and characterization of Ca-doped LaMnAsO},
author = {Liu, Yong and Straszheim, Warren E. and Das, Pinaki and Islam, Farhan and Heitmann, Thomas W. and McQueeney, Robert J. and Vaknin, David},
abstractNote = {Here, we report on our attempt to hole-dope the antiferromagnetic semiconductor LaMnAsO by substitution of the La3+ site by Ca2+. We use neutron and x-ray diffraction, magnetic susceptibility, and transport techniques to characterize polycrystalline (La1–xCax)MnAsO samples prepared by solid-state reaction and find that the parent compound is highly resistant to substitution with an upper limit x ≤ 0.01. Magnetic susceptibility of the parent and the x = 0.002(xnom = 0.04) compounds indicate a negligible presence of magnetic impurities (i.e., MnO or MnAs). Rietveld analysis of neutron and x-ray diffraction data shows the preservation of both the tetragonal (P4/nmm) structure upon doping and the antiferromagnetic ordering temperature, TN = 355 ± 5 K.},
doi = {10.1103/PhysRevMaterials.2.054410},
journal = {Physical Review Materials},
number = 5,
volume = 2,
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

FIG. 1 FIG. 1: (Color online) Powder X-ray di raction patterns for nominally Ca - La substituted samples (La1–xCax) MnAsO as indicated. The patterns are shifted for clarity, and xnom refers to the nominal amount in the preparation, and and xEDS is the amount determined by EDS (from here on for consistencymore » we use EDS value). The curves below the data show the di er- ence between the best t and the data. The tick-marks at the bottom of the gure show the expected peaks of pure LaM- nAsO. The dashed vertical lines show the peak positions of prominent di raction peaks of MnO and MnAs as indicated.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.