Relaxor–super-paraelectric behaviour and crystal-field–driven spin-phonon coupling in pyrochlore Eu 2 Ti 2 O 7
The temperature-dependent Raman spectroscopy and dielectric property of pyrochlore Eu 2 Ti 2 O 7 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-...
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Veröffentlicht in: | Europhysics letters 2022-01, Vol.137 (2), p.26003 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | The temperature-dependent Raman spectroscopy and dielectric property of pyrochlore Eu
2
Ti
2
O
7
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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ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/0295-5075/ac2455 |