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A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05)
The recent discovery of high temperature superconductivity in Fe arsenides has invigorated research into transition metal pnictides. Colossal magnetoresistance (CMR) has recently been reported for NdMnAsO1-xFx for x = 0.05–0.08, with a maximum magnetoresistance achieved at low temperature (MR(9T)(3 ...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4753427/ https://www.ncbi.nlm.nih.gov/pubmed/26875693 http://dx.doi.org/10.1038/srep20705 |
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author | Wildman, E. J. Mclaughlin, A. C. |
author_facet | Wildman, E. J. Mclaughlin, A. C. |
author_sort | Wildman, E. J. |
collection | PubMed |
description | The recent discovery of high temperature superconductivity in Fe arsenides has invigorated research into transition metal pnictides. Colossal magnetoresistance (CMR) has recently been reported for NdMnAsO1-xFx for x = 0.05–0.08, with a maximum magnetoresistance achieved at low temperature (MR(9T)(3 K)) = −95%). This appears to be a novel mechanism of CMR, which is as a result of a second order phase transition in field from an insulating antiferromagnet to a semiconducting paramagnet. Here we report a variable temperature synchrotron X-ray powder diffraction study of the CMR oxypnictide NdMnAsO(0.95)F(0.05) between 4 K–290 K. An excellent fit to the tetragonal unit cell with space group P4/nmm is obtained over the entire temperature range, with no change in crystal structure detected down to 4 K. A coupling of the lattice and magnetic order is observed, where subtle discontinuities in the temperature variation of a and the c/a ratio are apparent as the Nd spins order antiferromagnetically and the Mn moments reorient into the basal plane at T(SR.) The results suggest that very small changes in lattice parameters effect the coupling between lattice, electronic and magnetic degrees of freedom. |
format | Online Article Text |
id | pubmed-4753427 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-47534272016-02-23 A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) Wildman, E. J. Mclaughlin, A. C. Sci Rep Article The recent discovery of high temperature superconductivity in Fe arsenides has invigorated research into transition metal pnictides. Colossal magnetoresistance (CMR) has recently been reported for NdMnAsO1-xFx for x = 0.05–0.08, with a maximum magnetoresistance achieved at low temperature (MR(9T)(3 K)) = −95%). This appears to be a novel mechanism of CMR, which is as a result of a second order phase transition in field from an insulating antiferromagnet to a semiconducting paramagnet. Here we report a variable temperature synchrotron X-ray powder diffraction study of the CMR oxypnictide NdMnAsO(0.95)F(0.05) between 4 K–290 K. An excellent fit to the tetragonal unit cell with space group P4/nmm is obtained over the entire temperature range, with no change in crystal structure detected down to 4 K. A coupling of the lattice and magnetic order is observed, where subtle discontinuities in the temperature variation of a and the c/a ratio are apparent as the Nd spins order antiferromagnetically and the Mn moments reorient into the basal plane at T(SR.) The results suggest that very small changes in lattice parameters effect the coupling between lattice, electronic and magnetic degrees of freedom. Nature Publishing Group 2016-02-15 /pmc/articles/PMC4753427/ /pubmed/26875693 http://dx.doi.org/10.1038/srep20705 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Wildman, E. J. Mclaughlin, A. C. A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title | A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title_full | A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title_fullStr | A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title_full_unstemmed | A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title_short | A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO(0.95)F(0.05) |
title_sort | variable temperature synchrotron x-ray diffraction study of colossal magnetoresistant ndmnaso(0.95)f(0.05) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4753427/ https://www.ncbi.nlm.nih.gov/pubmed/26875693 http://dx.doi.org/10.1038/srep20705 |
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