Structural, Surface Morphology and Magneto-Transport properties of Self Flux Grown Eu Doped Bi2Se3 Single Crystal

TL;DR

This study investigates how europium doping affects the structural, surface morphology, and magneto-transport properties of Bi2Se3 topological insulator crystals, revealing complex quantum interference phenomena and reduced magneto-resistance.

Contribution

It provides new insights into Eu doping effects on Bi2Se3's electronic and magnetic properties, including the observation of WL/WAL crossover and magneto-transport behavior.

Findings

Eu doping reduces magneto-resistance significantly.

Complex crossover between WL and WAL observed at low fields.

Magneto-conductivity analysis shows competing WL and WAL effects.

Abstract

Here, we report the effect of europium (Eu) doping in Bi2Se3 topological insulator (TI) by using different characterization techniques viz. X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDXA) and magneto-transport measurements. Temperature dependent electrical resistivity curves revealed a metallic behaviour both in the presence and absence of applied magnetic field. Magneto-transport measurements showed a decrease in the magneto-resistance (MR) value of the Eu0.1Bi1.9Se3 sample (32% at 5K) in comparison to the pure Bi2Se3 sample (80% at 5K). For, Eu0.1Bi1.9Se3 sample, a complex crossover between WL and WAL phenomenon was observed at lower applied magnetic fields, whereas the same was absent in case of the pristine one. Further, HLN (Hikami Larkin Nagaoka) fitted magneto-conductivity (MC) analysis revealed a competing weak anti localization (WAL) and weak localization (WL) behaviour. Summarily, in the present work we study the structural, surface morphology and magneto-transport properties of as grown Eu0.1Bi1.9Se3 single crystals.