SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Frustrated Magnets: Strong Spin-Orbit Coupling

TT 52.5: Vortrag

Donnerstag, 30. März 2023, 16:00–16:15, HSZ 201

Evolution of electronic and magnetic properties of the Kitaev-type compound Ru(Br_1−xI_x)₃ — •Jihuan Gu¹, Tomohiro Takayama^1,2, Alexander Yaresko¹, and Hidenori Takagi^1,2 — ¹Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany — ²Institut für Funktionelle Materie und Quantentechnologien, University of Stuttgart, 70550 Stuttgart, Germany

Kitaev magnets like α-RuCl₃ have attracted great attention in the field of solid-state physics as a potential realization of exotic quantum spin-liquid state. If such Kitaev materials are turned into a metallic state, exotic electronic properties may be realized near the critical phase boundary, such as unconventional superconductivity. So far, carrier doping via intercalation or application of pressure has been attempted to induce a metal-insulator transition (MIT), but no metallic state has been obtained. Recently, the two honeycomb compounds RuBr₃ and RuI₃, which are isostructural to α-RuCl₃, have been reported. While RuBr₃ is a Mott insulator with a zigzag magnetic order, RuI₃ was reported to be a correlated semimetal, likely induced by the enhanced d-p hybridization. Hence, the MIT phase boundary should be expected between RuBr₃ and RuI₃. We thus synthesized Ru(Br_1−xI_x)₃ with various doping levels x. The successful substitution of Br with I was confirmed by the systematic change of lattice parameters. The MIT phase boundary seems to be at x around 0.7. We will discuss the evolution of electronic and magnetic properties in the series of Ru(Br_1−xI_x)₃ and a marginal metallic state near MIT.