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:
2003)
影响因子:
--
通讯作者:
Wildman EJ
Wildman EJ
中科院分区:
--
文献类型:
--
作者:
Wildman EJ

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在氧化铌酸盐NdMnAsO 1 −xFx中观察到的巨磁电阻效应(CMR)得到了进一步的研究。磁输运由磁极化子主导。系列Nd(Mn 1 −xCox)AsO0.95F0.05的磁阻测量表明,在锰位掺杂钴钉扎磁极化子并抑制CMR,当x = 0.047时,CMR被完全破坏。化学掺杂的结果在非化学计量的样品,与As和O的空缺。探讨了非化学计量比、磁有序、电子掺杂与CMR的关系。Nd的反铁磁转变和同时重新取向的Mn自旋到基面在23 K(TSR)是不受Co掺杂。然而,有一个显着的减少TN(Mn)的反铁磁转变被抑制从360 K到300 K,x从0-0.047增加。在相同的掺杂范围内,10 K下的Mn磁矩也从3.86(2)μB降低到3.21(2)μB。面内Mn矩的这种减少使电子-电子相关性降低到TSR以下,并且起到进一步减小磁阻的作用。
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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