Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 8: Crystallography in Materials Science, Microstructure and Dielectric Properties

KFM 8.3: Vortrag

Montag, 5. September 2022, 15:40–16:00, H7

Pressure-driven insulator-to-metal transition and superconductivity in one-dimensional transition-metal-trichalcogenide microstructures — •Chin Shen Ong1, L. F. Shi2,3, Jin-Guang Cheng2,3, Irina Gorlova4, Sergey Zybtsev4, Lingyi Ao5, Junwei Huang5, Hongtao Yuan5, Raman Thiyagarajan6, Vadim Pokrovskii4, Olle Eriksson1,7, and Mahmoud Abdel-Hafiez11Uppsala University, Uppsala, Sweden — 2Chinese Academy of Sciences, Beijing, China — 3University of Chinese Academy of Sciences, Beijing, China — 4Moscow — 5Nanjing University, Nanjing, China. — 6Indian Institute of Technology Madras, Chennai, India — 7Örebro University, Örebro, Sweden

Transition metal trichalcogenides exhibit large tunability of nontrivial electronic states by modifying chemical composition, temperature, and pressure. Despite great interest in TMTCs, very little information exists on how their electronic properties change with compression. Here, we systematically investigate the high-pressure behavior of n-type semiconducting TiS3 of one-dimensional microstructural form. High-pressure electrical resistance measurements up to 98 GPa identify an exotic sequence of transitions from being a semiconductor to insulator, then metal and finally, a hitherto undiscovered superconducting phase at pressures above 70 GPa. The experimental results are supported by first-principles theoretical calculations.

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