Abstract：
:Layered-structure materials are currently relevant given their quasi-2D nature. Knowledge of their physical properties is currently of major interest. Niobium ditelluride possesses a monoclinic layered-structure with a distortion in the tellurium planes. This structural complexity has hindered the determination of its fundamental physical properties. In this work, NbTe2 crystals were used to elucidate its structural, compositional, electronic and vibrational properties. These findings have been compared with calculations based on density functional theory. The chemical composition and elemental distribution at the nanoscale were obtained through atom probe tomography. Ultraviolet photoelectron spectroscopy allowed the first determination of the work function of NbTe2. Its high value, 5.32 eV, and chemical stability allow foreseeing applications such as contact in optoelectronics. Raman spectra were obtained using different excitation laser lines: 488, 633, and 785 nm. The vibrational frequencies were in agreement with those determined through density functional theory. It was possible to detect a theoretically-predicted, low-frequency, low-intensity Raman active mode not previously observed. The dispersion curves and electronic band structure were calculated, along with their corresponding density of states. The electrical properties, as well as a pseudo-gap in the density of states around the Fermi energy are characteristics proper of a semi metal.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Barajas-Aguilar AH,Irwin JC,Garay-Tapia AM,Schwarz T,Paraguay Delgado F,Brodersen PM,Prinja R,Kherani N,Jiménez Sandoval SJdoi
10.1038/s41598-018-35308-4subject
Has Abstractpub_date
2018-11-19 00:00:00pages
16984issue
1issn
2045-2322pii
10.1038/s41598-018-35308-4journal_volume
8pub_type
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