| Issue |
EPL
Volume 137, Number 2, January 2022
|
|
|---|---|---|
| Article Number | 26003 | |
| Number of page(s) | 6 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/ac2455 | |
| Published online | 13 April 2022 | |
Relaxor–super-paraelectric behaviour and crystal-field–driven spin-phonon coupling in pyrochlore Eu2Ti2O7
1 Department of Physics, Indian Institute of Technology (BHU) - Varanasi-221005, India
2 Department of Physics, Banaras Hindu University) - Varanasi-221005, India
3 Department of Physics, National Sun Yat Sen University - Kaohsiung-80424, Taiwan
(b) schatterji.app@iitbhu.ac.in (corresponding author)
Received: 3 August 2021
Accepted: 7 September 2021
The temperature-dependent Raman spectroscopy and dielectric property of pyrochlore Eu2Ti2O7 have been investigated. The appearance of additional phonon modes below 200 K is observed suggesting a local structural change. The anomalous softening of the phonon modes and existence of crystal-field-induced short-range magnetic ordering below 150 K unveiled the possible spin-phonon coupling. The signature behaviour of a dipolar glassy-relaxor state and super-paraelectric nature has been demonstrated. Additional dielectric anomaly at lower temperature, below 40 K, related to spin-spin correlation has also been reported.
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