Comprehensive analysis for the high field magneto-conductivity of Bi2Te3 single crystal

• Published in: Physica. B, Condensed matter Vol. 609; p. 412759
• Main Authors: Kumar, Yogesh, Sultana, Rabia, Awana, V.P.S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2021; Elsevier BV
• Subjects: Bismuth tellurides; Coherence length; Electrons; Heat conductivity; High temperature; Hikami-Larkin-Nagaoka model; Magnetic fields; Magneto-conductivity; Modelling; Phase coherence; Single crystal; Single crystals; Topological insulator; Weak anti-localization; Weak localization; Topological insulator; Weak localization; Magneto-conductivity; Weak anti-localization; Hikami-Larkin-Nagaoka model; Single crystal
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2020.412759

Here, we report the magneto-conductivity (up to 14 T and down to 5 K) analysis of Bi2Te3 single-crystal. A sharp magneto-conductivity (MC) rise (inverted v-type cusp) is observed near H = 0 due to the weak antilocalization (WAL) effect, while a linear curve is observed at higher fields. We account for magneto-conductivity (MC) over the entire range of applied magnetic fields of up to 14 T and temperatures from 100 K to 5 K in a modified HLN modelling (addition of quadratic (βH2) through quantum and classical components involvement. The additional term βH2 reveals a gradual change of a (HLN parameter) from −0.421(6) to −0.216(1) as the temperature increases from 5 K to 100 K. The phase coherence length Lϕ obtained from both conventional and modified modelling decreased with increasing temperature but remains more protracted than the mean free path (L) of electrons. The analysis shows that the quantum phase coherence effect dominates at high temperatures.