Journal article

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

  • Ban, W. J. Center for High Pressure Science and Technology Advanced Research, Beijing, China
  • Wu, D. S. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China - School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
  • Xu, Bing Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Luo, J. L. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China - School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
  • Xiao, Hong Center for High Pressure Science and Technology Advanced Research, Beijing, China
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    09.10.2019
Published in:
  • Journal of Physics: Condensed Matter. - 2019, vol. 31, no. 40, p. 405701
English We report magnetic susceptibility, resistivity and optical spectroscopy study on single crystal sample DySb. It exhibits extremely large magnetoresistance (XMR), and a magnetic phase transition from paramagnetic (PM) to antiferromagnetic (AFM) state at about 10 K. A 'screened' plasma edge at about 4000 cm−1 is revealed by optical measurement, which suggests that the material has a low carrier density. With decreasing temperature, the 'screened' plasma edge shows a blue shift, possibly due to a decrease of the effective mass of carriers. Notably, an anomalous temperature dependent midinfrared absorption feature is observed in the vicinity of the 'screened' plasma edge. In addition, it can be connected to the inflection point in the real part of the dielectric function , the frequency of which exactly tracks the temperature dependent 'screened' plasma frequency. This phenomena can be explained by the appearance of a coupled electron–plasmon 'plasmaron' feature.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308159
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