Galvanomagnetic effects in tellurium whiskers

Abstract

Galvanomagnetic effects on Te samples were studied. The measurements were made in the broad range of temperatures (1.5 K T 80 K) and the values of the magnetic field induction. Shubnikov-de-Haas oscillations (SH) were detected in strong magnetic fields (v c t ) 1, where v c is the cyclotrone frequency); as well as anomalous temperature dependence of the Hall potential in classically weak (v c t ( 1) magnetic fields. It was found out that the revealed SH oscillations are due to the Landau quantizations of the energy spectrum of three-dimensional (3D) charge carriers (holes) in the bulk samples under study. In the area of weak magnetic fields (v c t ( 1), the effect of anomalous magnetoresistance was found, which was due to the weak localization of 3D holes in the samples [1]. The theory of the Hall effect for holes in weak magnetic fields (B < 0.2 Т) was developed. It is based on the solution of kinetic Boltzmann equation with the specific type of the collision integral; taking into account the carriers energy spectrum in tellurium. It was shown that the peculiarities of the Hall effect temperature dependence; which were found experimentally in weak magnetic fields; can be qualitatively explained if we bear in mind the complex structure of tellurium valence band.

Quantum Linear Magnetoresistance and Nontrivial Berry Phase in High‐Mobility Elemental Tellurium

“…For SdH effect, the integer Landau indice always corresponds to the σ xx minimum. [ 43 ] Thus, the oscillations at φ = 60° show a reversal from dip to peak compared to the data at φ < 60° for the same integer Landau indice, which can be attributed to the smaller contribution of ρ yx to σ xx at larger φ.…”

“…Some important topics include the existence of a surface state and the underlying mechanism of various MR effects. [37][38][39][40] Since the hollow tubular structure of Te is common in a variety of different synthetic methods, [41][42][43] the effect of shape structure on the transport feature needs to be ruled out while it has not been carefully investigated. Theoretically, the band structure of the micro-sized tubes and flakes are the same since they both belong to 3D bulk Te samples.…”