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MM: Fachverband Metall- und Materialphysik
MM 59: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science VII - Nanomaterials
MM 59.6: Vortrag
Donnerstag, 10. März 2016, 18:00–18:15, H38
Interaction of commensurate charge density waves with anionic point defects in electron beam irradiated 1T-TaSe2 and 1T-TaS2 — •Michael Kinyanjui1, 2, Pia Kynrim2, Tibor Lehnert2, Janis Koster2, and Ute Kaiser2 — 1Helmholtz Insitute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany — 2Central Facility of Electron Microscopy, Ulm University, Albert Einstein Allee 11, 89068 Ulm, Germany
Low dimensional transition metal dichalcogenides (MX2, M = transition metal e.g Nb, Mo, Ti X= chalcogen e.g S, Te, Se) are of great interest due to some of their unique properties including metal-insulator transitions and charge density waves (CDW) observed as a function of temperature, pressure, and doping. Here we report on the interaction of commensurate charge density waves and anionic point defects in 1T-TaSe2 and 1T-TaS2. By using atomic resolved high resolution transmission microscopy (HRTEM) we show the loss of CDW long range order as a result of the interaction with S and Se vacancies generated by the electron beam irradiation. We discuss the loss of long range order as a result of the interaction between the CDW and the Friedel oscillations arising from the point defects.