Electronic structure of transition metal dichalcogenides PdTe2 and Cu0.05PdTe2 
superconductors obtained by angle-resolved photoemission spectroscopy

Liu, Y.; Zhao, J.; Yu, L.; Lin, C. T.; Hu, C.; Liu, D.; Peng, Y.; Xie, Z.; He, J.; Chen, C.; Feng, Y.; Yi, H.; Liu, X.; Zhao, L.; He, S.; Liu, G.; Dong, X.; Zhang, J.; Chen, C.; Xu, Z.; Weng, H.; Dai, X.; Fang, Z.; Zhou, X.

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Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy

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Yu, L.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Lin, C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons279843

Chen, C.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Liu, X.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Zhang, J.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Zhou, X.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Liu, Y., Zhao, J., Yu, L., Lin, C. T., Hu, C., Liu, D., et al. (2015). Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy. Chinese Physics B, 24(6): 067401.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CD16-3

Abstract

The layered transition metal chalcogenides have been a fertile land in solid state physics for many decades. Various MX2-type transition metal dichalcogenides, such as WTe2, IrTe2, and MoS2, have triggered great attention recently, either for the discovery of novel phenomena or some extreme or exotic physical properties, or for their potential applications. PdTe2 is a superconductor in the class of transition metal dichalcogenides, and superconductivity is enhanced in its Cu-intercalated form, Cu0.05PdTe2. It is important to study the electronic structures of PdTe2 and its intercalated form in order to explore for new phenomena and physical properties and understand the related superconductivity enhancement mechanism. Here we report systematic high resolution angle-resolved photoemission (ARPES) studies on PdTe2 and Cu0.05PdTe2 single crystals, combined with the band structure calculations. We present in detail for the first time the complex multi-band Fermi surface topology and densely-arranged band structure of these compounds. By carefully examining the electronic structures of the two systems, we find that Cu-intercalation in PdTe2 results in electron-doping, which causes the band structure to shift downwards by nearly 16 meV in Cu0.05PdTe2. Our results lay a foundation for further exploration and investigation on PdTe2 and related superconductors.