NMR studies of the topological insulator Bi2Te3

TL;DR

This study uses NMR spectroscopy to investigate the electronic and structural properties of the topological insulator Bi2Te3 across a broad temperature range, revealing temperature-dependent spectral behaviors.

Contribution

It provides detailed NMR analysis of Bi2Te3, including temperature effects and orientation-dependent spectral features, advancing understanding of its topological insulator properties.

Findings

Spectral behavior changes below 91 K for c parallel orientation

Activation energy related to thermal activation observed

Differences between powder and single crystal samples identified

Abstract

Te NMR studies were carried out for the bismuth telluride topological insulator in a wide range from room temperature down to 12.5 K. The measurements were made on a Bruker Avance 400 pulse spectrometer. The NMR spectra were collected for the mortar and pestle powder sample and for single crystalline stacks with orientations c parallel and perpendicular to field. The activation energy responsible for thermal activation. The spectra for the stack with c parallel to field showed some particular behavior below 91 K.