Anisotropic thermoelectric and superconducting properties of the bulk misfit-layered (SnSe)1.17(TaSe2) compound

Kim, Jin Hee; Yun, Jung‐Ho; Song, Young-Joon; Rhyee, Jong‐Soo

doi:10.1016/j.cap.2021.04.018

Cited by 2 publications

(3 citation statements)

References 29 publications

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“…Furthermore, the obtained XRD data of the starting sample were processed with the Rietveld refinement utilizing the General Structure Analysis System (GSAS) software package, yielding the correspondent lattice parameters for the pristine sample: a = b = 3.214 ± 0.004 Å, c = 12.783 ± 0.008 Å, α = β = 90°, γ = 120°, and V = 114.42 ± 0.73 Å 3 under ambient conditions. It is clear that there exist some inevitably subtle deviations between the observed and calculated results, which is highly correlated with atomic coordinates, the occupancies in the unit cell, and the crystalline orientation of the two-dimensional Janus WSSe crystal. , Moreover, the detailed crystallographic data for WSSe are illustrated in Table S1 of the Supporting Information. Collectively, our results manifested that the pristine sample belongs to the high-quality Janus WSSe with hexagonal symmetry.…”

Section: Methodsmentioning

confidence: 99%

“…It is clear that there exist some inevitably subtle deviations between the observed and calculated results, which is highly correlated with atomic coordinates, the occupancies in the unit cell, and the crystalline orientation of the two-dimensional Janus WSSe crystal. 38,39 Moreover, the detailed crystallographic data for WSSe are illustrated in Table S1 of the Supporting Information. Collectively, our results manifested that the pristine sample belongs to the highquality Janus WSSe with hexagonal symmetry.…”

Section: Methodsmentioning

confidence: 99%

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Pressure-Driven Structural and Electronic Transitions in a Two-Dimensional Janus WSSe Crystal

Hong,

Dai,

et al. 2023

Inorg. Chem.

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In this work, we presented the first report on the highpressure structural stability and electrical transport characteristics in WSSe under different hydrostatic environments through Raman spectroscopy, electrical conductivity, and high-resolution transmission electron microscopy (HRTEM) coupled with first-principles theoretical calculations. For nonhydrostatic conditions, WSSe endured a phase transition at 15.2 GPa, followed by a semiconductor-to-metal crossover at 25.3 GPa. Furthermore, the bandgap closure was accounted for the metallization of WSSe as derived from theoretical calculations. Under hydrostatic conditions, ∼ 2.0 GPa pressure hysteresis was detected for the emergence of phase transition and metallization in WSSe because of the feeble deviatoric stress. Upon depressurization, the reversibility of the phase transition was substantiated by those of microscopic HRTEM observations under different hydrostatic environments. Our highpressure investigation on WSSe advances the insightful understanding of the crystalline structure and electronic properties for the Janus transition-metal dichalcogenide (TMD) family and boosts prospective developments in functional devices.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Pressure-Driven Structural and Electronic Transitions in a Two-Dimensional Janus WSSe Crystal

Hong,

Dai,

et al. 2023

Inorg. Chem.

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“…MLCs have been known for a long time and their structures as a function of the RS and TMD composition have been thoroughly investigated. , However, the exploration of physical properties such as Ising superconductivity, − charge density waves (CDW), − or topological effects is quite recent. The research in the field has led to remarkable results, but it has mostly proceeded by isolated discoveries and trial and error chemical synthesis, while general rules to understand what happens when assembling different RS units and TMDs are missing.…”

mentioning

confidence: 99%

Misfit Layer Compounds as Ultratunable Field Effect Transistors: From Charge Transfer Control to Emergent Superconductivity

et al. 2023

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Misfit layer compounds are heterostructures composed of rocksalt units stacked with few-layer transition metal dichalcogenides. They host Ising superconductivity, charge density waves, and good thermoelectricity. The design of misfits' emergent properties is, however, hindered by the lack of a global understanding of the electronic transfer among the constituents. Here, by performing first-principles calculations, we unveil the mechanism controlling the charge transfer and demonstrate that rocksalt units are always donor and dichalcogenides acceptors. We show that misfits behave as a periodic arrangement of ultratunable field effect transistors where a charging as large as ≈6 × 10 14 e − cm −2 can be reached and controlled efficiently by the La−Pb alloying in the rocksalt. Finally, we identify a strategy to design emergent superconductivity and demonstrate its applicability in (LaSe) 1.27 (SnSe 2 ) 2 . Our work paves the way to the design synthesis of misfit compounds with tailored physical properties.

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Anisotropic thermoelectric and superconducting properties of the bulk misfit-layered (SnSe)1.17(TaSe2) compound

Cited by 2 publications

References 29 publications

Pressure-Driven Structural and Electronic Transitions in a Two-Dimensional Janus WSSe Crystal

Pressure-Driven Structural and Electronic Transitions in a Two-Dimensional Janus WSSe Crystal

Misfit Layer Compounds as Ultratunable Field Effect Transistors: From Charge Transfer Control to Emergent Superconductivity

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