Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system

A theory of thermodynamic properties of a spin density wave (SDW) in a quasi-two-dimensional system (with a preset impurity concentration x) is constructed. We choose an anisotropic dispersion relation for the electron energy and assume that external magnetic field H has an arbitrary direction relat...

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Autores principales:	Moscalenco, Sveatoslav, Palistrant, Maria, Ursu, Vitalie, Calalb, Mihai
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2014
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/418b668d63bb4416be30de63c0217829
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spelling	oai:doaj.org-article:418b668d63bb4416be30de63c02178292021-11-21T11:58:58ZInfluence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system537.6+538.92537-63651810-648Xhttps://doaj.org/article/418b668d63bb4416be30de63c02178292014-12-01T00:00:00Zhttps://mjps.nanotech.md/archive/2014/article/39444https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365A theory of thermodynamic properties of a spin density wave (SDW) in a quasi-two-dimensional system (with a preset impurity concentration x) is constructed. We choose an anisotropic dispersion relation for the electron energy and assume that external magnetic field H has an arbitrary direction relative to magnetic moment MQ. The system of equations defining order parameters , , Mz, and Mσ is constructed and transformed with allowance for umklapp scattering (U-processes). Special cases when H \|\| MQ and H ⊥ MQ (HzHσ = 0) are considered in detail as well as cases of weak fields H of arbitrary direction. The condition for the transition of the system to the commensurate and incommensurate states of the SDW is analyzed. The concentration dependence of magnetic transition temperature TM is calculated, and the components of the order parameter for the incommensurate phase are determined. The phase diagram (T, ) is constructedMoscalenco, SveatoslavPalistrant, MariaUrsu, VitalieCalalb, MihaiD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 13, Iss 3-4, Pp 195-204 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Moscalenco, Sveatoslav Palistrant, Maria Ursu, Vitalie Calalb, Mihai Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
description	A theory of thermodynamic properties of a spin density wave (SDW) in a quasi-two-dimensional system (with a preset impurity concentration x) is constructed. We choose an anisotropic dispersion relation for the electron energy and assume that external magnetic field H has an arbitrary direction relative to magnetic moment MQ. The system of equations defining order parameters , , Mz, and Mσ is constructed and transformed with allowance for umklapp scattering (U-processes). Special cases when H \|\| MQ and H ⊥ MQ (HzHσ = 0) are considered in detail as well as cases of weak fields H of arbitrary direction. The condition for the transition of the system to the commensurate and incommensurate states of the SDW is analyzed. The concentration dependence of magnetic transition temperature TM is calculated, and the components of the order parameter for the incommensurate phase are determined. The phase diagram (T, ) is constructed
format	article
author	Moscalenco, Sveatoslav Palistrant, Maria Ursu, Vitalie Calalb, Mihai
author_facet	Moscalenco, Sveatoslav Palistrant, Maria Ursu, Vitalie Calalb, Mihai
author_sort	Moscalenco, Sveatoslav
title	Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
title_short	Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
title_full	Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
title_fullStr	Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
title_full_unstemmed	Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
title_sort	influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2014
url	https://doaj.org/article/418b668d63bb4416be30de63c0217829
work_keys_str_mv	AT moscalencosveatoslav influenceofthemagneticfieldandimpurityonthecommensurateincommensuratephasetransitioninaquasitwodimensionalmagneticsystem AT palistrantmaria influenceofthemagneticfieldandimpurityonthecommensurateincommensuratephasetransitioninaquasitwodimensionalmagneticsystem AT ursuvitalie influenceofthemagneticfieldandimpurityonthecommensurateincommensuratephasetransitioninaquasitwodimensionalmagneticsystem AT calalbmihai influenceofthemagneticfieldandimpurityonthecommensurateincommensuratephasetransitioninaquasitwodimensionalmagneticsystem
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Influence of the magnetic field and impurity on the commensurate–incommensurate phase transition in a quasi-two-dimensional magnetic system

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