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Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys
Metallic Ni(1−x)V(x) alloys exhibit a ferromagnetic to paramagnetic disordered quantum phase transition in bulk. Such a phase transition is accompanied by a quantum Griffiths phase (QGP), featuring fractional power-law temperature dependences of physical variables, like magnetic susceptibility and s...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430624/ https://www.ncbi.nlm.nih.gov/pubmed/28432366 http://dx.doi.org/10.1038/s41598-017-01423-x |
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author | Swain, Priyadarsini Srivastava, Suneel K. Srivastava, Sanjeev K. |
author_facet | Swain, Priyadarsini Srivastava, Suneel K. Srivastava, Sanjeev K. |
author_sort | Swain, Priyadarsini |
collection | PubMed |
description | Metallic Ni(1−x)V(x) alloys exhibit a ferromagnetic to paramagnetic disordered quantum phase transition in bulk. Such a phase transition is accompanied by a quantum Griffiths phase (QGP), featuring fractional power-law temperature dependences of physical variables, like magnetic susceptibility and specific heat, at low temperatures. As nanoparticles (NP’s) usually exhibit properties significantly different from their bulk counterparts, it is intriguing to explore the occurrence of quantum Griffiths phase in Ni(1−x)V(x) nanoalloys. NP’s of Ni(1−x)V(x) (0 ≤ x ≤ 0.17) alloys are prepared by a chemical reflux method. The structure and composition of the nanoalloys are determined by X-ray diffraction, X-ray photoelectron spectroscopy and electron microscopy techniques. Metallicity of the samples has been ensured by electrical resistivity measurements. DC magnetization results suggest that ferromagnetism persists in the NP’s until x = 0.17. Low-temperature upturns in magnetic susceptibility and heat capacity hint at critical fluctuations evolving with V-doping. The fluctuations might stem from isolated Ni-clusters within the ferromagnetic NP, indicating a QGP region ranging from x = 0.085 to x ≫ 0.17. |
format | Online Article Text |
id | pubmed-5430624 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-54306242017-05-15 Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys Swain, Priyadarsini Srivastava, Suneel K. Srivastava, Sanjeev K. Sci Rep Article Metallic Ni(1−x)V(x) alloys exhibit a ferromagnetic to paramagnetic disordered quantum phase transition in bulk. Such a phase transition is accompanied by a quantum Griffiths phase (QGP), featuring fractional power-law temperature dependences of physical variables, like magnetic susceptibility and specific heat, at low temperatures. As nanoparticles (NP’s) usually exhibit properties significantly different from their bulk counterparts, it is intriguing to explore the occurrence of quantum Griffiths phase in Ni(1−x)V(x) nanoalloys. NP’s of Ni(1−x)V(x) (0 ≤ x ≤ 0.17) alloys are prepared by a chemical reflux method. The structure and composition of the nanoalloys are determined by X-ray diffraction, X-ray photoelectron spectroscopy and electron microscopy techniques. Metallicity of the samples has been ensured by electrical resistivity measurements. DC magnetization results suggest that ferromagnetism persists in the NP’s until x = 0.17. Low-temperature upturns in magnetic susceptibility and heat capacity hint at critical fluctuations evolving with V-doping. The fluctuations might stem from isolated Ni-clusters within the ferromagnetic NP, indicating a QGP region ranging from x = 0.085 to x ≫ 0.17. Nature Publishing Group UK 2017-04-21 /pmc/articles/PMC5430624/ /pubmed/28432366 http://dx.doi.org/10.1038/s41598-017-01423-x Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Swain, Priyadarsini Srivastava, Suneel K. Srivastava, Sanjeev K. Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title | Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title_full | Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title_fullStr | Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title_full_unstemmed | Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title_short | Exploring quantum Griffiths phase in Ni(1−x)V(x) nanoalloys |
title_sort | exploring quantum griffiths phase in ni(1−x)v(x) nanoalloys |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430624/ https://www.ncbi.nlm.nih.gov/pubmed/28432366 http://dx.doi.org/10.1038/s41598-017-01423-x |
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