Experimental study of transport properties of Weyl semimetal LaAlGe thin films grown by molecular beam epitaxy

Abstract

Rare earth compounds display diverse electronic, magnetic, and magneto-transport properties. Recently these compounds of the type RAlGe (R = La, Ce, Pr) have been shown to exhibit Weyl semimetallic behavior. In this work, we have investigated the crystal structure, electronic, and magneto-transport properties of the Weyl semimetal LaAlGe thin films grown by molecular beam epitaxy. The temperature dependence of longitudinal resistivity at different magnetic fields is discussed. Observations of magnetoresistances and Hall effect at different temperatures and their evolution with magnetic field up to 6 T are also discussed with relevant mechanisms. We have observed positive unsaturated magnetoresistances, with a small quadratic contribution at low temperatures, which tends to saturate at higher fields. The Hall measurements confirm the electron-dominated semimetallic conduction with an average charge carrier density of ~ 9.68*10^21 cm^(-3) at room temperature.

arXiv commentThis article has been published in Journal of Vacuum Science and Technology A. This paper is a part of the Special Topic Collection on Topological Materials

References in corpus (28)

• Type-II Weyl Semimetals
• Titanic Magnetoresistance in WTe2
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
• Topological response in Weyl semimetals and the chiral anomaly
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• Quantum Oscillations from Surface Fermi-Arcs in Weyl and Dirac Semi-Metals
• Colossal Bulk Photovoltaic Effect in a Weyl Semimetal
• Consequences of breaking time reversal symmetry in LaSb: a resistivity plateau and extreme magnetoresistance
• Photocurrents in Weyl semimetals
• Berry Curvature Enhanced Nonlinear Photogalvanic Response of Type-II Weyl Cone
• Large nonsaturating magnetoresistance and signature of non-degenerate Dirac nodes in ZrSiS
• Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
• Origin of the turn-on temperature behavior in WTe${}_2$
• Large magnetoresistance in LaBi: origin of field-induced resistivity upturn and plateau in compensated semimetals
• Friedel oscillations due to Fermi arcs in Weyl semimetals
• Nonlinear planar Hall effect
• Helical Fermi arcs and surface states in time-reversal invariant Weyl semimetals
• Magnetism and anomalous transport in the Weyl semimetal PrAlGe: Possible route to axial gauge fields
• Visualizing "Fermi arcs" in the Weyl semimetal TaAs
• Single crystal investigation of proposed type-II Weyl semimetal CeAlGe
• Towards Weyltronics: Realization of epitaxial NbP and TaP Weyl Semimetal thin films
• Bulk single crystal growth of the theoretically predicted magnetic Weyl semimetals $R$AlGe ($R$ = Pr, Ce)
• Twisted Fermi surface of a thin-film Weyl semimetal
• High Fermi velocities and small cyclotron masses in LaAlGe
• Molecular beam epitaxy growth of nonmagnetic Weyl semimetal LaAlGe thin film
• Generation of Spin Currents by Magnetic Field in $\mathcal{T}$- and $\mathcal{P}$-Broken Materials
• Transport characteristics of type II Weyl semimetal MoTe2 thin films grown by chemical vapor deposition