Charge density wave collapse of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound - Archive ouverte HAL
Article Dans Une Revue Physical Review B Année : 2024

Charge density wave collapse of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound

Grégory Setnikar
Amit Pawbake
Laurent Cario
Marie-Aude Méasson

Résumé

Misfit layer compounds, heterostructures composed of a regular alternating stacking of rocksalt monochalcogenide bilayers and few-layer transition-metal dichalcogenides, are an emergent platform to investigate highly doped transition-metal dichalcogenides. Among them, (LaSe)1.14(NbSe2)2 1.14 (NbSe 2 ) 2 displays Ising superconductivity, while the presence of a charge density wave (CDW) in the material is still under debate. Here, by using polarized Raman spectroscopy and first-principles calculations, we show that NbSe2 2 undergoes a doping-driven collapse of the CDW ordering within the misfit, and no signature of the CDW is detected down to 8 K. We provide a complete experimental and theoretical description of the lattice dynamics of this misfit compound. We show that the vibrational properties are obtained from those of the two subunits, namely, the LaSe unit and the NbSe2 2 bilayer, in the presence of a suitable field-effect doping, and then highlight the two-dimensional nature of the lattice dynamics of NbSe2 2 within the (LaSe)1.14(NbSe2)2 1.14 (NbSe 2 ) 2 three-dimensional structure.
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Dates et versions

hal-04703611 , version 1 (26-09-2024)

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Ludovica Zullo, Grégory Setnikar, Amit Pawbake, Tristan Cren, Christophe Brun, et al.. Charge density wave collapse of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound. Physical Review B, 2024, 110 (7), pp.075430. ⟨10.1103/PhysRevB.110.075430⟩. ⟨hal-04703611⟩
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