Journal Article

PUBDB-2024-05620

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Self-Stacked 1T-1H Layers in 6R-NbSeTe and the Emergence of Charge and Magnetic Correlations Due to Ligand Disorder

Mahatha, S. K.Extern*DESY* ; Phillips, J. ; Corral-Sertal, J. ; Subires, D. ; Korshunov, A. ; Kar, A.Extern* ; Buck, J.Extern*XFEL.EU*DESY* ; Diekmann, F.Extern*DESY* ; Garbarino, G. ; Ivanov, Y. P. ; Chuvilin, A. ; Mondal, D. ; Vobornik, I. ; Bosak, A.Extern* ; Rossnagel, K.DESY* ; Pardo, V. ; Fumega, A. O. ; Blanco-Canosa, S. (Corresponding author)Extern*

2024
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsnano.4c02005  doi:10.3204/PUBDB-2024-05620

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.

Note: restricted document, copyright restrictions

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Contributing Institute(s):

1. FS-SXQM (FS-SXQM)
2. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)434434223 - SFB 1461: Neuroelektronik: Biologisch inspirierte Informationsverarbeitung (434434223) (434434223)

Experiment(s):

1. PETRA Beamline P04 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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