Layered van der Waals topological metals of TaTMTe4 (TM = Ir, Rh, Ru) family

Abstract

Layered van~der~Waals materials of the family TaTMTe${}_4$ (TM=Ir, Rh, Ru) are showing very interesting electronic properties. Here we report the synthesis, crystal growth and structural characterization of TaIrTe${}_4$, TaRhTe${}_4$, TaIr${}_{1-x}$Rh${}_x$Te${}_4$ ($x=0.06$; 0.14; 0.78; 0.92) and Ta${}_{1+x}$Ru${}_{1-x}$Te${}_4$ single crystals. For Ta${}_{1+x}$Ru${}_{1-x}$Te${}_4$ off-stoichiometry is shown. X-ray powder diffraction confirms that TaRhTe4 is isostructural to TaIrTe4. We show that all these compounds are metallic with diamagnetic behavior. Ta${}_{1.26(2)}$Ru${}_{0.75(2)}$Te${}_{4.000(8)}$ exhibits an upturn in the resistivity at low temperatures which is strongly field dependent. Below $T\approx 4$K we observed signatures of the superconductivity in the TaIr${}_{1-x}$Rh${}_x$Te${}_4$ compounds for $x=0.92$. Magnetotransport measurements on all samples show weak magnetoresistance (MR) field dependence that is typically quadratic-in-field. However, for TaIr${}_{1-x}$Rh${}_x$Te${}_4$ with $x\approx 0.78$, the MR has a linear term dominating in low fields that indicates the presence of Dirac cones in the vicinity of the Fermi energy. For TaRhTe${}_4$ series the MR is almost isotropic. We have performed electronic structure calculations for isostructural TaIrTe${}_4$ and TaRhTe${}_4$ together with the projected total density of states. The main difference is appearance of the Rh-band close to the Fermi level.

References in corpus (27)

• Type-II Weyl Semimetals
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Titanic Magnetoresistance in WTe2
• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
• Superconductivity in Weyl Semimetal Candidate MoTe2
• Edge conduction in monolayer WTe2
• Spectroscopic evidence for type II Weyl semimetal state in MoTe2
• Observation of Fermi Arcs in Type-II Weyl Semimetal Candidate WTe2
• TaIrTe4 a ternary Type-II Weyl semi-metal
• Room temperature nonlinear Hall effect and wireless RF rectification in Weyl semimetal TaIrTe4
• Temperature dependent three-dimensional anisotropy of the magnetoresistance in WTe${}_2$
• Experimental realization of type-II Weyl state in non-centrosymmetric TaIrTe${}_4$
• Measuring Chern numbers above the Fermi level in the Type II Weyl semimetal Mo${}_x$W${}_{1-x}$Te${}_2$
• Van der Waals Stacking Induced Topological Phase Transition in Layered Ternary Transition Metal Chalcogenides
• Superconductivity enhancement in the S-doped Weyl semimetal candidate MoTe2
• Observation of an edge supercurrent in the Weyl superconductor MoTe${}_2$
• Polar and phase domain walls with conducting interfacial states in a Weyl semimetal MoTe2
• Surface Superconductivity in the type II Weyl Semimetal TaIrTe4
• Magnetotransport and de Haas-van Alphen measurements in the type-II Weyl semimetal TaIrTe${}_4$
• Electronic Evidence for Type II Weyl Semimetal State in MoTe2
• Surface superconductivity in the Weyl semimetal MoTe2 detected by point contact spectroscopy
• Quantum spin Hall effect in monolayer and bilayer TaIrTe${}_4$
• Bulk Fermi surface of the type-II Weyl semimetal candidate NbIrTe${}_4$
• Nonsaturating magnetoresistance and nontrivial band topology of type-II Weyl semimetal NbIrTe4
• Switchable domains in point contacts based on transition metal tellurides

Cited by in corpus (4)

• A complementary screening for quantum spin Hall insulators in 2D exfoliable materials
• Switchable domains in point contacts based on transition metal tellurides
• Single Crystal Growth and Transport Properties of van der Waals Materials $AB$Te${}_4$ ($A/B$ = Ti, Zr, Hf)
• Layer dependent topological phases and transitions in TaRhTe${}_4$: From monolayer and bilayer to bulk