Layered van der Waals Topological Metals of TaTMTe4 (TM = Ir, Rh, Ru) Family

G Shipunov; B R Piening; C Wuttke; T A Romanova; A V Sadakov; O A Sobolevskiy; E Yu Guzovsky; A S Usoltsev; V M Pudalov; D V Efremov; S Subakti; D Wolf; A Lubk; B Büchner; S Aswartham

doi:10.1021/acs.jpclett.1c01648

Layered van der Waals Topological Metals of TaTMTe₄ (TM = Ir, Rh, Ru) Family

J Phys Chem Lett. 2021 Jul 22;12(28):6730-6735. doi: 10.1021/acs.jpclett.1c01648. Epub 2021 Jul 15.

Authors

G Shipunov¹, B R Piening¹, C Wuttke¹, T A Romanova², A V Sadakov², O A Sobolevskiy², E Yu Guzovsky², A S Usoltsev², V M Pudalov², D V Efremov¹, S Subakti¹, D Wolf¹, A Lubk¹, B Büchner^{1

3

4}, S Aswartham¹

Affiliations

¹ Institute for Solid State Research, Leibniz IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
² P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
³ Institute of Solid State and Materials Physics, Technische Universität Dresden, 01062 Dresden, Germany.
⁴ Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany.

PMID: 34264086
DOI: 10.1021/acs.jpclett.1c01648

Abstract

Layered van der Waals materials of the family TaTMTe₄ (TM = Ir, Rh, Ru) are showing interesting electronic properties. We report the growth and characterization of TaIrTe₄, TaRhTe₄, TaIr_1-xRh_xTe₄ (x = 0.06, 0.14, 0.78, 0.92), Ta_1+xRu_1-xTe₄ single crystals. X-ray powder diffraction confirms that TaRhTe₄ is isostructural to TaIrTe₄. All these compounds are metallic with diamagnetic behavior. Below T ≈ 4 K we observed signatures of the superconductivity in the TaIr_1-xRh_xTe₄ compounds for x = 0.92. All samples show weak quadratic-in-field magnetoresistance (MR). However, for TaIr_1-xRh_xTe₄ with x ≈ 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 TaRhTe₄ series the MR is almost isotropic. Electronic structure calculations for TaIrTe₄ and TaRhTe₄ reveal appearance of the Rh band close to the Fermi level.