Influence of magnetic (Fe) and non-magnetic (In) doping on structural, magnetic, and weak anti-localization properties of Bi2Te3 topological insulator. (1st March 2023)

• Record Type: Journal Article
• Authors: Kander, Niladri Sekhar; Guchhait, Suman; Das, A K
• Is Part Of: Physica scripta. Volume 98:Number 3(2023)
• Publication Date: 2023-03-01
• Subjects: quantum effect -- topological insulator -- spin-orbit interactions -- weak anti-localization -- pauli paramagnetism; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/acb513
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: In this article, we have studied the changes in structural, magnetic, and magneto-transport properties of Bi2 Te3 topological insulator doped with magnetic (Fe) as well as non-magnetic (In) elements. The un-doped along with Fe, In-doped Bi2 Te3 are grown using a melt growth technique. The Rietveld analysis of x-ray diffraction data expresses that both In and Fe-dopants substituted the Bi-position with a little bit of interstitial incorporation in host Bi2 Te3 . It is also noticed that In-doping is slightly more favorable for Bi-substitution than Fe. The magnetic characterization reveals a mixing of diamagnetic and Pauli paramagnetic behavior of un-doped and In-doped Bi2 Te3, whereas, Fe-doping shows overall paramagnetism with local anti-ferromagnetic interactions among Fe-ions without long-range order. The electrical-transport study represents the metallic response of host Bi2 Te3, which is well-maintained for In-doping; however, Fe-doping exhibits prominent anomalies in ρ xx –T profiles. Importantly, magneto-conductance research indicates a notable deviation of host quantum feature, weak anti-localization effect (WAL) upon magnetic (Fe) doping, whereas non-magnetic In-doping shows a comparatively weak deviation in WAL effect for high doping limit.