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
Hauptverfasser: Alam, Mohd, Pal, Arkadeb, Anand, Khyati, Ghosh, Surajit, Tripathi, Saurabh, Singh, Ranjan K., Ghosh, A. K., Yang, H. D., Chatterjee, Sandip
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Sprache:eng
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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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/ac2455