Rajaji, V ; Janaky, S ; Sarma, Saurav Ch. ; Peter, Sebastian C ; Narayana, Chandrabhas (2019) Pressure induced topological and structural phase transitions in 1T-TiSe2: a Raman study Journal of Physics: Condensed Matter, 31 (16). p. 165401. ISSN 0953-8984
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Official URL: http://doi.org/10.1088/1361-648X/ab01bb
Related URL: http://dx.doi.org/10.1088/1361-648X/ab01bb
Abstract
High pressure Raman spectroscopy studies on 1T-TiSe2 were carried out up to ~20.5 GPa. Based on the anomalies in phonon linewidth (lifetime) and phonon frequency of A1g mode, we observe three transitions at ~2.5 GPa, ~6.0 GPa and ~15 GPa. The transitions at ~2.5 and ~6.0 GPa are the two topological phase transitions consistent with the theoretical prediction by Zhu et al in 1T-TiSe2 under pressure, namely, a topological trivial to non-trivial transition (Z2 = 1) and topological non-trivial to trivial transition (Z2 = 0). The trigonal (1T) phase of TiSe2 is stable up to ~15 GPa beyond which it undergoes structural transition as seen from the appearance of new Raman modes. There is a coexistence of the 1T and the new high-pressure phase up to ~19 GPa. The structural transition is completely reversible as seen from the appearance of 1T phase Raman spectra upon release of the pressure.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics Publishing. |
ID Code: | 124176 |
Deposited On: | 08 Nov 2021 07:13 |
Last Modified: | 08 Nov 2021 07:13 |
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