skip to main content

SciTech ConnectSciTech Connect

Title: Semimetal-semiconductor transition and giant linear magnetoresistances in three-dimensional Dirac semimetal Bi{sub 0.96}Sb{sub 0.04} single crystals

Three-dimensional (3D) Dirac semimetals are new quantum materials and can be viewed as 3D analogues of graphene. Many fascinating electronic properties have been proposed and realized in 3D Dirac semimetals, which demonstrate their potential applications in next generation quantum devices. Bismuth-antimony Bi{sub 1−x}Sb{sub x} can be tuned from a topological insulator to a band insulator through a quantum critical point at x ≈ 4%, where 3D Dirac fermions appear. Here, we report on a magnetotransport study of Bi{sub 1−x}Sb{sub x} at such a quantum critical point. An unusual magnetic-field induced semimetal-semiconductor phase transition was observed in the Bi{sub 0.96}Sb{sub 0.04} single crystals. In a magnetic field of 8 T, Bi{sub 0.96}Sb{sub 0.04} single crystals show giant magnetoresistances of up to 6000% at low-temperature, 5 K, and 300% at room-temperature, 300 K. The observed magnetoresistances keep linear down to approximate zero-field when the temperature is below 200 K. Our experimental results are not only interesting for the fundamental physics of 3D Dirac semimetals but also for potential applications of 3D Dirac semimetals in magnetoelectronic devices.
Authors:
;  [1] ;  [2]
  1. Spintronics and Electronic Materials Group, Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Squires Way, North Wollongong, New South Wales 2500 (Australia)
  2. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)
Publication Date:
OSTI Identifier:
22482078
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BISMUTH; FERMIONS; GRAPHENE; MAGNETIC FIELDS; MAGNETORESISTANCE; MONOCRYSTALS; PHASE TRANSFORMATIONS; SEMICONDUCTOR MATERIALS; SEMIMETALS; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0273-0400 K; THREE-DIMENSIONAL LATTICES