Regensburg 2025 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 13: Poster
DS 13.55: Poster
Donnerstag, 20. März 2025, 18:00–20:00, P1
Charge Density Waves and resulting properties of polycrystalline CuTe Films — Johannes Holters, •Christian Stenz, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, Germany
Charge density waves (CDWs) are periodic modulations of charge density in materials, often coupled with structural distortions and electronic property changes. The layered transition metal monochalcogenide CuTe exhibits a CDW phase below 335 K in single crystals, accompanied by a Peierls distortion along its Te-chains, which confines electron transport to a quasi-1D channel. While this phenomenon has been extensively studied in bulk single crystals, its manifestation in polycrystalline thin films is less well characterized. Here, we investigate the CDW phase and topological properties of sputter-deposited CuTe thin films with varying thickness. We observe that the CDW transition persists in these films, and its characteristics are influenced by thickness and microstructure. By modeling the resistivity curves, we extract key physical parameters, like the CDW transition temperature and its broadening due to the grain size distribution. Further, we explore the topological semimetal (TSM) characteristics in the non-CDW state (T>335K), examining features such as magnetoresistance and the planar Hall effect. Our results highlight the robustness of the CDW in polycrystalline CuTe and its sensitivity to film structure, extending the understanding of CDW behavior beyond bulk crystals. These findings reveal the interplay between CDWs, TSMs and microstructure, offering potential for novel device applications.
Keywords: Charge Density Wave (CDW); Transition Metal Chalcogenide (TMC); Topological Semimetal (TSM); Planar Hall Effect (PHE); Planar Angular Magnetoresistance (PAMR)