Polymorphic Layered MoTe2 from Semiconductor, Topological Insulator, to Weyl 
Semimetal

Sankar, Raman; Rao, G. Narsinga; Muthuselvam, I. Panneer; Butler, Christopher; Kumar, Nitesh; Murugan, G. Senthil; Shekhar, Chandra; Chang, Tay-Rong; Wen, Cheng-Yen; Chen, Chun-Wei; Lee, Wei-Li; Lin, M. -T.; Jeng, Horng-Tay; Felser, Claudia; Chou, F. C.

doi:10.1021/acs.chemmater.6b04363

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Polymorphic Layered MoTe₂ from Semiconductor, Topological Insulator, to Weyl Semimetal

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Kumar, Nitesh
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shekhar, Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Sankar, R., Rao, G. N., Muthuselvam, I. P., Butler, C., Kumar, N., Murugan, G. S., et al. (2017). Polymorphic Layered MoTe₂ from Semiconductor, Topological Insulator, to Weyl Semimetal. Chemistry of Materials, 29(2), 699-707. doi:10.1021/acs.chemmater.6b04363.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002C-A6A2-3

Zusammenfassung

Large size (similar to 2 cm) single crystals of layered MoTe2 in both 2H- and 1T'-types were synthsized using TeBr4 as the source of Br-2 transport agent in chemical vapor transport growth. The crystal structures of the as-grown single crystals were fully characterized by X-ray diffraction, Raman spectroscopy, scanning transmission electron microscopy, scanning tunneling microscopy (STM), and electrical resistivity (rho) measurements. The resistivity rho(T), magnetic susceptibility chi(T), and heat capacity C-p(T) measurement results reveal a first order structural phase transition near similar to 240 K for 1T'-MoTe2, which has been identified to be the orthorhombic Td-phase of MoTe2 as a candidate of Weyl semimetal. The STM study revealed different local defect geometries found on the surface of 2H- and Td-types of MoTe6 units in trigonal prismatic and distorted octahedral coordination, respectively.