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Related Experiment Video

Updated: Feb 13, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Published on: March 7, 2018

Towards atomically-thin regime in bulk 4H-NbSe₂ with interlayer disorder.

Edoardo Martino¹, Alla Arakcheeva¹, Helmuth Berger¹

¹École Polytechnique Fédérale de Lausanne (EPFL), Institute of Physics, Lausanne, Switzerland.

NPJ 2D Materials and Applications

|February 12, 2026

Summary

This summary is machine-generated.

Disordered stacking in 4H_a-NbSe₂ hinders layer coherence, pushing bulk crystals towards 2D physics. This structural disorder explains enhanced resistivity anisotropy and critical fields compared to 2H_a-NbSe₂.

Keywords:

Electronic properties and materials Superconducting properties and materials

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Last Updated: Feb 13, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

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Published on: March 7, 2018

Bulk Droplet Vitrification for Primary Hepatocyte Preservation

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Published on: May 29, 2018

Area of Science:

Materials Science
Condensed Matter Physics

Background:

Polytypism in transition metal dichalcogenides (TMDs) offers tunable electronic properties in layered van der Waals materials.
Larger unit cell polytypes, like four- or six-layer structures, act as natural homostructures with potential for exotic electronic states.

Purpose of the Study:

To investigate the structural and charge transport properties of metallic and superconducting 4H_a-NbSe₂.
To understand how structural disorder in 4H_a-NbSe₂ influences its electronic and superconducting characteristics.

Main Methods:

Detailed out-of-plane resistivity measurements.
Structural characterization of 4H_a-NbSe₂.
Comparative analysis with 2H_a-NbSe₂.

Main Results:

4H_a-NbSe₂ exhibits highly disordered layer stacking, impeding interlayer coherence.
This disorder effectively transitions the bulk material towards an atomically thin limit.
Disordered structure accounts for enhanced resistivity anisotropy and superconducting upper critical field compared to 2H_a-NbSe₂.

Conclusions:

Disordered stacking in 4H_a-NbSe₂ is crucial for its observed electronic properties.
This phenomenon can be leveraged to induce quasi-two-dimensional physics in bulk crystals.
Thorough structural analysis is vital for studying large-unit-cell TMD polytypes.