Anisotropy of the resistivity and charge-carrier sign in nanolaminated Ti<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>AlC: Experiment and<i>ab initio</i>calculations

Mauchamp, Vincent; Yu, Wenbo; Gence, Loïk; Piraux, Luc; Cabioc’h, Thierry; Gauthier, V.; Eklund, Per; Dubois, S.

doi:10.1103/physrevb.87.235105

Cited by 39 publications

(23 citation statements)

References 39 publications

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“…Subsequent transport work supported this idea [24]. Based on the preponderance of evidence to date, most researchers have concluded that indeed holes are the majority carriers in the basal planes [1,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Magnetotransport in the MAX phases and their 2D derivatives: MXenes

Ouisse

Barsoum

2017

Materials Research Letters

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Herein, we critically assess magnetotransport in the MAX phases and their 2D derivatives, MXenes. For some MAX phases, a simple, 2D hexagonal metal model describes weak-field magnetotransport of their nearly free electrons reasonably well. For others, experimental and/or theoretical Fermi surfaces need to be mapped-a crucial task required for true understanding. Even less is known about MXenes. The density of apparent mobile carriers in Ti 3 C 2 T x -assuming a single-band model-is ≈ 1 × 10 14 cm −2 (10 28 cm −3 ), which justifies it being sometimes described as a 2D metal. Much work is needed before a clearer picture emerges. IMPACT STATEMENTMagnetotransport in the MAX phases and their 2D derivatives MXene are critically reviewed for the first time. For some, a 2D hexagonal metal can explain magnetotransport; in others not. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Magnetotransport in the MAX phases and their 2D derivatives: MXenes

Ouisse

Barsoum

2017

Materials Research Letters

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“…[3] Additionally, the layered structure causes properties such as electrical conductivity to be anisotropic. [4] MAX phases are commonly synthesized using bulk methods such as pressureless sintering, hot pressing and reactive hot isostatic pressing. [5] Bulk methods yield polycrystalline samples of varying phase purities although phase pure samples are not uncommon.…”

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confidence: 99%

“…As the quality of sputtered films has progressively improved, work has started to focus on creating single crystal films for more detailed measurements of the intrinsic properties, initially most commonly with respect to conduction [4,16] but more recently also magnetism. [17][18][19][20][21] In order to realize the full potential of this family of inherently layered materials, the reproducibility and quality of samples have to be improved.…”

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confidence: 99%

Toward Structural Optimization of MAX Phases as Epitaxial Thin Films

Ingason

Petruhins

Rosén

2016

Materials Research Letters

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Prompted by the increased focus on MAX phase materials and their two-dimensional counterparts MXenes, a brief review of the current state of affairs in the synthesis of MAX phases as epitaxial thin films is given. Current methods for synthesis are discussed and suggestions are given on how to increase the material quality even further as well as arrive at those conditions faster. Samples were prepared to exemplify the most common issues involved with the synthesis, and through suggested paths for resolving these issues we attain samples of a quality beyond what has previously been reported. Keywords: MAX Phase, Thin Films, Reproducible Materials Synthesis, Sample QualityImpact Statement: We aim to address the quality of MAX phase thin films and suggest a more robust route for the synthesis of samples of consistent reproducible quality.

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“…Currently, the research efforts are directed towards, for example, 2D structures, such as graphene-like exfoliated MAX phase sheets (MXenes) [4][5][6], MAX phase nanotubes [7], manufacturing of freestanding structures [8], as well as understanding their optical [9,10], anisotropic [11][12][13], and magnetic [14][15][16][17][18][19] properties.…”

Section: Background To the Research Field Of The Thesismentioning

confidence: 99%

Synthesis and Characterization of New MAX Phase Alloys

Mockuté¹

2014

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The cover image is based on a cross-sectional TEM micrograph of a high current pulsed cathodic arc deposited (Cr 0.8 Mn 0.2 ) 2 AlC thin film (20 nm thickness), revealing its island-like nature. © Aurelija MockutėISBN: 978-91-7519-407-3 ISSN 0345-7524 Printed by LiU-Tryck Linköping, Sweden, 2014 AbstractThis Thesis explores synthesis and characterization of new MAX phase alloys (M = early transition metal, A = A-group element, and X = C or N), based on incorporation of M and X elements previously not considered. My primary focus is on M = Mn for attaining magnetic properties, and on X = O for potential tuning of the transport properties. A recent theoretical study predicted (Cr 1-x Mn x ) 2 AlC MAX phase to be a stable magnetic nanolaminate. I aimed at realizing this material and through a combinatorial approach based on magnetron sputtering from elemental targets, the first experimental evidence of Mn incorporation (x = 0.16) in a MAX phase is presented. The corresponding MAX phase was also synthesized using cathodic arc film deposition (x = 0.20) and bulk synthesis methods (x = 0.06). The primary characterization techniques were X-ray diffraction and high-resolution (scanning) transmission electron microscopy in combination with energy dispersive X-ray spectroscopy and/or electron energy loss spectroscopy, to obtain a precise local quantification of the MAX phase composition and to perform lattice resolved imaging. For epitaxial film growth of (Cr 1-x Mn x ) 2 AlC, evidence is presented for the formation of (Cr 1-y Mn y ) 5 Al 8 , exhibiting a bcc structure with an interplanar spacing matching exactly half a unit cell of the hexagonal MAX phase. Consequently, routinely performed X-ray diffraction symmetric θ-2θ measurements result in peak positions that are identical for the two phases. As (Cr 1-y Mn y ) 5 Al 8 is shown to display a magnetic response, its presence needs to be taken into consideration when evaluating the magnetic properties of the MAX phase. Methods to distinguish between Populärvetenskaplig sammanfattningMaterialvetenskap inkluderar forskning på material, dess syntes, struktur och sammansättning samt resulterande egenskaper, med fokus på att utveckla nya material skräddarsydda för specifika ändamål.En viktig del inom materialvetenskapen är forskning på tunna filmer, d.v.s. lager av material med tjocklek från ett atomlager till några mikrometer. Egenskaperna hos en yta, till exempel friktion, slitmotstånd, ledningsförmåga, eller utseende, kan förbättras genom att applicera en lämplig tunnfilm.Den här avhandlingen handlar om en grupp material som kallas MAX-faser. M står för en övergångsmetall (t.ex. Ti, Cr, Nb, Sc), A för ett element från grupp A i det periodiska systemet (t.ex. Al, Si, Ge, Ga), och X står för C eller N. Atomer av tre sådana olika element staplas i en struktur bestående av rena atomlager, t.ex. M-X-M-A-M-X-M-A. Ti 2 AlC, Cr 2 AlC, Ti 3 SiC 2 och Ti 4 AlN 3 är några exempel av mer än 60 hittills upptäckta MAX-faser. Det extra spännande med MAX-faser är att de kombinerar ...

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Anisotropy of the resistivity and charge-carrier sign in nanolaminated Ti2AlC: Experiment andab initiocalculations

Cited by 39 publications

References 39 publications

Magnetotransport in the MAX phases and their 2D derivatives: MXenes

Magnetotransport in the MAX phases and their 2D derivatives: MXenes

Toward Structural Optimization of MAX Phases as Epitaxial Thin Films

Synthesis and Characterization of New MAX Phase Alloys

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