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  Intrinsic insulating ground state in transition metal dichalcogenide TiSe2

Campbell, D. J., Eckberg, C., Zavalij, P. Y., Kung, H.-H., Razzoli, E., Michiardi, M., et al. (2019). Intrinsic insulating ground state in transition metal dichalcogenide TiSe2. Physical Review Materials, 3(5): 053402, pp. 1-10. doi:10.1103/PhysRevMaterials.3.053402.

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 Creators:
Campbell, Daniel J.1, Author
Eckberg, Chris1, Author
Zavalij, Peter Y.1, Author
Kung, Hsiang-Hsi1, Author
Razzoli, Elia1, Author
Michiardi, Matteo2, Author              
Jozwiak, Chris1, Author
Bostwick, Aaron1, Author
Rotenberg, Eli1, Author
Damascelli, Andrea1, Author
Paglione, Johnpierre1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: The transition metal dichalcogenide TiSe2 has received significant research attention over the past four decades. Different studies have presented ways to suppress the 200 K charge-density-wave transition, vary low-temperature resistivity by several orders of magnitude, and stabilize magnetism or superconductivity. Here we give the results of a synthesis technique whereby samples were grown in a high-pressure environment with up to 180 bar of argon gas. Above 100 K, properties are nearly unchanged from previous reports, but a distinct hysteretic resistance region begins around 80 K, accompanied by insulating low-temperature behavior. An accompanying decrease in carrier concentration is seen in Hall effect measurements, and photoemission data show a removal of an electron pocket from the Fermi surface in an insulating sample. We conclude that high inert gas pressure synthesis accesses an underlying nonmetallic ground state in a material long speculated to be an excitonic insulator.

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Language(s): eng - English
 Dates: 2019-05-142019-05-14
 Publication Status: Published in print
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mat.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 3 (5) Sequence Number: 053402 Start / End Page: 1 - 10 Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953