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Issue 41, 2018
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The suppression of CMR in Nd(Mn1−xCox)AsO0.95F0.05

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The colossal magnetoresistance (CMR) observed in the oxypnictide NdMnAsO1−xFx has been further investigated. The magnetotransport is dominated by magnetopolarons. Magnetoresistance measurements of the series Nd(Mn1−xCox)AsO0.95F0.05 show that doping with cobalt on the manganese site pins the magnetopolarons and suppresses the CMR, which is completely destroyed by x = 0.047. The chemical doping results in non-stoichiometric samples, with both As and O vacancies. The relationship between the non-stoichiometry, magnetic order, electron doping and CMR is explored. The Nd antiferromagnetic transition and simultaneous reorientation of the Mn spins into the basal plane at 23 K (TSR) is not effected by Co doping. However, there is a significant decrease in TN(Mn) as the antiferromagnetic transition is suppressed from 360 K to 300 K as x increases from 0–0.047. The manganese moment at 10 K is also reduced from 3.86(2)μB to 3.21(2)μB over the same doping range. This reduction in the in-plane Mn moment decreases the electron–electron correlations below TSR and acts to further diminish the magnetoresistance.

Graphical abstract: The suppression of CMR in Nd(Mn1−xCox)AsO0.95F0.05

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Publication details

The article was received on 27 Jul 2018, accepted on 20 Sep 2018 and first published on 28 Sep 2018

Article type: Paper
DOI: 10.1039/C8DT03071E
Citation: Dalton Trans., 2018,47, 14726-14733

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    The suppression of CMR in Nd(Mn1−xCox)AsO0.95F0.05

    E. J. Wildman, K. S. McCombie, G. B. G. Stenning and A. C. Mclaughlin, Dalton Trans., 2018, 47, 14726
    DOI: 10.1039/C8DT03071E

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