Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn0.25TaS2and Fe0.25TaS2

Danz, Thomas; Liu, Q.; Zhu, Xiaobin; Wang, L.H.; Cheong, S.-W.; Radu, Ilie; Ropers, Claus; Tobey, R. I.

doi:10.1088/0953-8984/28/35/356002

Cited by 14 publications

(8 citation statements)

References 38 publications

(62 reference statements)

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“…The weak inter-layer bonding of TMDs facilitates control of film thickness via growth or exfoliation down to sub-monolayer. As TMDs are reduced to 2D, novel physics often emerges such as itinerant magnetism [2], an indirect to direct bandgap transition [3,4], quantum spin Hall effect [5], and strongly enhanced charge density wave (CDW) order [6]. This breadth of phenomena makes 2D TMDs a promising platform both for the development of next generation devices and important fundamental studies.…”

Section: Introductionmentioning

confidence: 99%

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

et al. 2020

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The electronic and magnetic properties of transition metal dichalcogenides are known to be extremely sensitive to their structure. In this paper we study the effect of structure on the electronic and magnetic properties of mono-and bilayer VSe 2 films grown using molecular beam epitaxy. VSe 2 has recently attracted much attention due to reports of emergent ferromagnetism in the two-dimensional (2D) limit. To understand this compound, high-quality 1T and distorted 1T films were grown at temperatures of 200°C and 450°C, respectively, and studied using 4 K scanning tunneling microscopy and spectroscopy. The measured density of states and the charge density wave (CDW) patterns were compared to band structure and phonon dispersion calculations. Films in the 1T phase reveal different CDW patterns in the first layer compared to the second. Interestingly, we find the second layer of the 1T film shows a CDW pattern with 4a × 4a periodicity which is the 2D version of the bulk CDW observed in this compound. Our phonon dispersion calculations confirm the presence of a soft phonon at the correct wave vector that leads to this CDW. In contrast, the first layer of distorted 1T phase films shows a strong stripe feature with varying periodicities, while the second layer displays no observable CDW pattern. Finally, we find that the monolayer 1T VSe 2 film is weakly ferromagnetic, with ∼3.5 μ B per unit similar to previous reports.

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Section: Introductionmentioning

confidence: 99%

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

et al. 2020

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“…While various ultrafast spectroscopy techniques have been used to investigate the electronic dynamics of thin layer and bulk TMDCs, − studies of the transient behavior of nonequilibrium structures via probes of the ultrafast lattice dynamics following laser excitation can provide unique insights into the properties of these layered materials. − Titanium diselenide (TiSe 2 ) is a semimetal TMDC with exotic properties such as charge density waves (CDW) and superconductivity at low temperatures, − whose dynamics are dominated by electron–phonon interactions. Phonon softening and Kohn anomalies have been reported in TiSe 2 above the CDW transition temperature T c (∼189 K) for the lowest phonon mode L 1 – at the Brillouin zone boundary. , The CDW transition and the phonon softening strongly depend on the thickness of the layered sample, and the mechanism behind the CDW transition in TiSe 2 is still under intense debate. − Several studies point to a Jahn–Teller effect as the likely explanation of CDW in TiSe 2 rather than an excitonic insulator mechanism. ,, The former should, in principle, include strong electron–lattice interactions. , Recently, through the inclusion of exact, nonlocal exchange in density functional theory (DFT) calculations, strong electron–phonon coupling and lattice distortions are predicted to drive the CDW formation in TiSe 2 .…”

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confidence: 99%

Strongly Coupled Electron–Phonon Dynamics in Few-Layer TiSe₂ Exfoliates

Karam

Blake

2018

ACS Photonics

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Ultrafast electron diffraction is used to probe the time-resolved dynamics in a few-layer TiSe 2 sample. At normal incidence, the suppression of the Bragg diffraction peak intensities following photoexcitation displays strongly biexponential behavior. For tilted samples, changes in the diffraction peak positions reveal coherent acoustic vibrations that are dependent on the sample thickness and that further permit a calculation of the Young's modulus. The complex room temperature lattice dynamics observed are attributed to strong electron−phonon coupling and electron−lattice equilibration processes, which support a Jahn−Teller origin of the charge density wave behavior in TiSe 2 . Additionally, the significant role that the related Kohn anomalies may play in the electron transport dynamics and transition mechanism of this material is emphasized. These results demonstrate the importance of strongly coupled electron−phonon dynamics in the relaxation of electronically excited room temperature TiSe 2 , which is expected to impact its applicability in optoelectronics.

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“…The exfoliation of thin samples of such intercalated transition metal dichalcogenides can refer to the method in Ref. [64].…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional ferromagnetism and magnetotransport in van der Waals Mn-intercalated tantalum disufide

Liu,

Hu,

Stavitski

et al. 2021

Preprint

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Van der Waals (vdW) ferromagnets are an important class of materials for spintronics applications. The recent discovery of atomically vdW magnets CrI3 and Cr2Ge2Te6 has triggered a renaissance in the area of two-dimensional (2D) magnetism. Herein we systematically studied 2H-Mn0.28TaS2 single crystal, a 2D vdW ferromagnet with Tc ∼ 82.3 K and a large in-plane magnetic anisotropy. Mn K-edge x-ray absorption spectroscopy was measured to provide information on its electronic state and local atomic environment. The detailed magnetic isotherms measured in the vicinity of Tc indicates that the spin coupling inside 2H-Mn0.28TaS2 is of a three-dimensional (3D) Heisenberg-type coupled with the attractive long-range interaction between spins that decay as J(r) ≈ r −4.85 . Both resistivity ρ(T ) and thermopower S(T ) exhibit anomalies near Tc, confirming that the hole-type transport carriers strongly interact with local moments. An unusual angle-dependent magnetoresistance is further observed, suggesting a possible field-induced novel magnetic structure.

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Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn_0.25TaS₂and Fe_0.25TaS₂

Cited by 14 publications

References 38 publications

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

Strongly Coupled Electron–Phonon Dynamics in Few-Layer TiSe₂ Exfoliates

Three-dimensional ferromagnetism and magnetotransport in van der Waals Mn-intercalated tantalum disufide

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Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn0.25TaS2and Fe0.25TaS2

Cited by 14 publications

References 38 publications

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

Strongly Coupled Electron–Phonon Dynamics in Few-Layer TiSe2 Exfoliates

Three-dimensional ferromagnetism and magnetotransport in van der Waals Mn-intercalated tantalum disufide

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Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn_0.25TaS₂and Fe_0.25TaS₂

Strongly Coupled Electron–Phonon Dynamics in Few-Layer TiSe₂ Exfoliates