Self-Stacked 1T-1H Layers in 6R-NbSeTe and the Emergence of Charge and Magnetic Correlations Due to Ligand Disorder

Sanjoy K. Mahatha, Jan Phillips, Javier Corral-Sertal, David Subires, Artem Korshunov, Arunava Kar, Jens Buck, Florian Diekmann, Gaston Garbarino, Yurii P. Ivanov, Andrey Chuvilin, Debashis Mondal, Ivana Vobornik, Alexei Bosak, Kai Rossnagel, Victor Pardo, Adolfo O. Fumega, Santiago Blanco-Canosa*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The emergence of correlated phenomena arising from the combination of 1T and 1H van der Waals layers is the focus of intense research. Here, we synthesize a self-stacked 6R phase in NbSeTe, showing perfect alternating 1T and 1H layers that grow coherently along the c-direction, as revealed by scanning transmission electron microscopy. Angle-resolved photoemission spectroscopy shows a mixed contribution of the trigonal and octahedral Nb bands to the Fermi level. Diffuse scattering reveals temperature-independent short-range charge fluctuations with propagation vector qCO = (0.25 0), derived from the condensation of a longitudinal mode in the 1T layer, while the long-range charge density wave is quenched by ligand disorder. Magnetization measurements suggest the presence of an inhomogeneous, short-range magnetic order, further supported by the absence of a clear phase transition in the specific heat. These experimental analyses in combination with ab initio calculations indicate that the ground state of 6R-NbSeTe is described by a statistical distribution of short-range charge-modulated and spin-correlated regions driven by ligand disorder. Our results demonstrate how natural 1T-1H self-stacked bulk heterostructures can be used to engineer emergent phases of matter.

Original languageEnglish
Pages (from-to)21052-21060
Number of pages9
JournalACS Nano
Volume18
Issue number32
DOIs
Publication statusPublished - 13 Aug 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • 2D heterostructures
  • ab initio calculations
  • ARPES
  • magnetism
  • transition metal dichalcogenides
  • transmission electron microscopy
  • X-ray scattering

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