Characterization of the charge density wave transition and observation of the amplitude mode in LaAuSb2

C. N. Kuo, D. Shen, B. S. Li, Nguyen Nhat Quyen, W. Y. Tzeng, C. W. Luo, L. M. Wang, Y. K. Kuo, C. S. Lue

Research output: Contribution to journalArticle

Abstract

In order to elucidate the charge density wave (CDW) nature in LaAuSb2, we have carried out the electrical resistivity, Hall coefficient, Seebeck coefficient, thermal conductivity, as well as ultrafast pump-probe spectroscopy measurements on single crystalline LaAuSb2. The CDW phase transition has been characterized by marked features near TC≃88K. In particular, the obtained Hall carrier concentration and electronic thermal conductivity exhibit significant reduction as TC drops, providing strong evidence for partial gapping of the Fermi surfaces during the CDW phase transition. Furthermore, the ultrafast pump-probe spectroscopy reveals pronounced oscillatory features in the photoinduced transient reflectivity in the CDW ordered state. A characteristic oscillation mode with frequency of about 0.32 THz was extracted. The comparison of the obtained oscillation frequency with the frequencies of the amplitude mode in the well-studied CDW analogue LaAgSb2 allows us to ascribe the observation to the amplitude mode of CDW collective excitations in LaAuSb2.

Original languageEnglish
Article number235121
JournalPhysical Review B
Volume99
Issue number23
DOIs
Publication statusPublished - 2019 Jun 10

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Charge density waves
Thermal conductivity
thermal conductivity
Phase transitions
Pumps
Spectroscopy
pumps
oscillations
Fermi surface
Seebeck coefficient
probes
wave excitation
Seebeck effect
spectroscopy
Fermi surfaces
Carrier concentration
Hall effect
analogs
Crystalline materials
reflectance

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kuo, C. N. ; Shen, D. ; Li, B. S. ; Quyen, Nguyen Nhat ; Tzeng, W. Y. ; Luo, C. W. ; Wang, L. M. ; Kuo, Y. K. ; Lue, C. S. / Characterization of the charge density wave transition and observation of the amplitude mode in LaAuSb2. In: Physical Review B. 2019 ; Vol. 99, No. 23.
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Characterization of the charge density wave transition and observation of the amplitude mode in LaAuSb2. / Kuo, C. N.; Shen, D.; Li, B. S.; Quyen, Nguyen Nhat; Tzeng, W. Y.; Luo, C. W.; Wang, L. M.; Kuo, Y. K.; Lue, C. S.

In: Physical Review B, Vol. 99, No. 23, 235121, 10.06.2019.

Research output: Contribution to journalArticle

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AU - Shen, D.

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AU - Luo, C. W.

AU - Wang, L. M.

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