Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L45: Electronic Correlations in di-chalcogenides and Related
11:15 AM–1:51 PM,
Wednesday, March 7, 2018
LACC
Room: 505
Sponsoring
Unit:
DCMP
Chair: Rico Schoenemann, Natl High Magnetic Field Lab
Abstract ID: BAPS.2018.MAR.L45.13
Abstract: L45.00013 : Antiferroelectric Distortion with Anomalous Phonon Softening in Excitonic Insulator Ta2NiSe5
1:39 PM–1:51 PM
Presenter:
Akitoshi Nakano
(Applied Physics, Nagoya University)
Authors:
Akitoshi Nakano
(Applied Physics, Nagoya University)
Shinya Tamura
(Applied Physics, Nagoya University)
Naoyuki Katayama
(Applied Physics, Nagoya University)
Takumi Hasegawa
(Graduate School of Integrated Arts and Sciences, Hiroshima Univsersity)
Satoshi Tsutsui
(JASRI)
Hiroshi Sawa
(Applied Physics, Nagoya University)
An anomalous acoustic phonon softening which was observed just above Ts indicates that the structural phase transition of Ta2NiSe5 is classified as the ferroelastic transition. Furthermore, an anomaly also occurs in linewidth of the particular optical phonon mode.
[1] Wakisaka, Y. et al., Phys. Rev. Lett. 103, 026402 (2009).
[2] Di Salvo, F. J. et al., J. Less Common Metals 116, 51–61 (1986).
[3] Kaneko, T.et al., Phys. Rev. B 87, 035121 (2013).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.L45.13
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