The suppression of CMR in Nd(Mn1-xCox)AsO0.95F0.05.
The suppression of CMR in Nd(Mn1-xCox)AsO0.95F0.05.
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Nd(Mn1-xCox)AsO0.95F0.05 中 CMR 的抑制。
DOI:
10.1039/c8dt03071e
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Wildman EJ
中科院分区:
文献类型:
--
作者:
Wildman EJ
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.
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