Giant and anisotropic magnetoresistances in p-type Bi-doped Sb ₂ Te ₃ bulk single crystals

Abstract

Antimony telluride (Sb2Te3) compounds are well known as excellent thermoelectric materials and have been recently confirmed as three-dimensional topological insulators. In this letter, we have investigated the anisotropic magneto-transport properties of p-type Bi-doped Sb2Te3 bulk single crystals over a broad range of temperatures, degrees and magnetic fields. Giant magnetoresistance (MR) of up to 230% was observed, which exhibits quadratic field dependences in low fields and becomes linear at high fields without any trend towards saturation. The giant MR also shows strong anisotropy with anisotropy ratio up to 210% in angle-dependent measurements. The giant MR might result from strong intervalley and intravalley scattering of holes and the strong anisotropy is attributable to the anisotropy of hole mobility, relaxation time and effective mass in the Fermi surface. The observed giant anisotropic MR could find applications in Sb2Te3based anisotropic magneto-electronic devices.

Semimetal-semiconductor transition and giant linear magnetoresistances in three-dimensional Dirac semimetal Bi0.96Sb0.04 single crystals

“…Similar measurement configurations can be found in our former works. 19,20 Figure 1 in a higher field (B > 0.1 T), the resistivity increases monotonically with decreasing temperature, and the Bi 0.96 Sb 0.04 single crystal behaves as a semiconductor. The temperature dependence of the MR was extracted and is displayed in Figure 1(b).…”

“…Similar measurement configurations can be found in our former works. 19,20 Figure 1(a) shows the temperature dependence of the measured resistance in Bi 0.96 Sb 0.04 single crystals for a series of applied magnetic fields. In 0 T and 0.1 T, the resistivity, ρ, monotonically decreases with decreasing temperature, and the Bi 0.96 Sb 0.04 single crystal behaves as a metal.…”

Layered Topological Insulators and Semimetals for Magnetoresistance Type Sensors

“…Yue et al. showed a high out‐of‐plane MR anisotropy ratio (210%) in Sb 2 Te 3 bulk single crystals . The MR anisotropy ratio is defined as (MR max − MR min )/MR min × 100%.…”

Cross-over from weak localization to anti-localization in rare earth doped TRS protected topological insulators

“…Magneto-transport measurements represent an important approach to explore the electronic characteristics of quantum materials. [19][20][21][22][23][24][25] Magnetoresistance (MR = (RH-R0)/R0 × 100%) is the change of electrical resistance of a material in an externally-applied magnetic field. has wide applications in magnetic data storage, magnetic sensors, and magnetoelectronic devices.…”

“…has wide applications in magnetic data storage, magnetic sensors, and magnetoelectronic devices. [26][27][28] Chalcogenide insulators (eg. Sb2Te3, Bi2Te3 ) have large linear giant magnetoresistance over several hundred percent.…”