Magnetoresistance and Shubnikov-de Hass oscillation in YSb

TL;DR

This study investigates the magnetoresistance and quantum oscillations in YSb crystals, revealing large magnetoresistance, a metal-insulator transition, and trivial topological properties through experimental and theoretical analysis.

Contribution

It provides the first detailed transport and quantum oscillation measurements of YSb, establishing its trivial topological nature and characterizing its Fermi surface.

Findings

Large transverse magnetoresistance of 3.47×10^4% at 2.5 K and 14 T

Observation of Shubnikov-de Haas oscillations revealing Fermi surface details

Ysb identified as a topologically trivial material through ARPES and calculations

Abstract

YSb crystals are grown and the transport properties under magnetic field are measured. The resistivity exhibits metallic behavior under zero magnetic field and the low temperature resistivity shows a clear upturn once a moderate magnetic field is applied. The upturn is greatly enhanced by increasing magnetic field, finally resulting in a metal-to-insulator-like transition. With temperature further decreased, a resistivity plateau emerges after the insulator-like regime. At low temperature (2.5 K) and high field (14 T), the transverse magnetoresistance (MR) is quite large (3.47 $\times 10^4\%$ ). In addition, Shubnikov-de Haas (SdH) oscillation has also been observed in YSb. Periodic behavior of the oscillation amplitude reveals the related information about Fermi surface and two major oscillation frequencies can be obtained from the FFT spectra of the oscillations. The trivial Berry phase extracted from SdH oscillation, band structure revealed by angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations demonstrate that YSb is a topologically trivial material.