Volume 128, Number 5, December 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 February 2020|
Probing emergent excitations with middle-energy electron energy loss spectroscopy
1 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences - Ningbo, Zhejiang 315201, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049, China
3 Department of Physics and Astronomy, Rutgers University - Piscataway, NJ 08854, USA
Received: 29 August 2019
Accepted: 9 December 2019
Probing the emergent excitations in a range of is fundamentally important to understand a variety of emergent phenomena in quantum materials, however, the characterization techniques of which are very limited at present. Here, we take high-temperature superconducting YBa2Cu3O7−δ films () as an archetype to demonstrate the powerful capabilities of middle-energy electron energy loss spectroscopy (EELS) in determining the emergent excitations. Three dominative features (2.9, 12.9, and 25 eV) are observed in the EELS spectra, one of which is a newly observed peak near 2.9 eV resulting from excitations between the Zhang-Rice state and the upper Hubbard band. Moreover, incident energy-dependent EELS spectra indicate that the signals of these three features are strongly dependent on the energy of incident electrons. Our work provides a route to probe emergent excitations in the energy range with utilizing high-resolution two-dimensional energy and momentum mapping.
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 73.43.Fj – Novel experimental methods; measurements
© EPLA, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.