Exploring quantum Griffiths phase in Ni1−x V x nanoalloys

Abstract Metallic Ni1−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 susceptibilit...

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Autores principales:	Priyadarsini Swain, Suneel K. Srivastava, Sanjeev K. Srivastava
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/681c0516a0744dc283d2a4ca687d48c8
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spelling	oai:doaj.org-article:681c0516a0744dc283d2a4ca687d48c82021-12-02T11:53:07ZExploring quantum Griffiths phase in Ni1−x V x nanoalloys10.1038/s41598-017-01423-x2045-2322https://doaj.org/article/681c0516a0744dc283d2a4ca687d48c82017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01423-xhttps://doaj.org/toc/2045-2322Abstract Metallic Ni1−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 Ni1−x V x nanoalloys. NP’s of Ni1−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.Priyadarsini SwainSuneel K. SrivastavaSanjeev K. SrivastavaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Priyadarsini Swain Suneel K. Srivastava Sanjeev K. Srivastava Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
description	Abstract Metallic Ni1−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 Ni1−x V x nanoalloys. NP’s of Ni1−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	article
author	Priyadarsini Swain Suneel K. Srivastava Sanjeev K. Srivastava
author_facet	Priyadarsini Swain Suneel K. Srivastava Sanjeev K. Srivastava
author_sort	Priyadarsini Swain
title	Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
title_short	Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
title_full	Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
title_fullStr	Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
title_full_unstemmed	Exploring quantum Griffiths phase in Ni1−x V x nanoalloys
title_sort	exploring quantum griffiths phase in ni1−x v x nanoalloys
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/681c0516a0744dc283d2a4ca687d48c8
work_keys_str_mv	AT priyadarsiniswain exploringquantumgriffithsphaseinni1xvxnanoalloys AT suneelksrivastava exploringquantumgriffithsphaseinni1xvxnanoalloys AT sanjeevksrivastava exploringquantumgriffithsphaseinni1xvxnanoalloys
_version_	1718394870750511104

Exploring quantum Griffiths phase in Ni1−x V x nanoalloys

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