Relaxor–super-paraelectric behaviour and crystal-field–driven spin-phonon coupling in pyrochlore Eu2Ti2O7. (1st January 2022)

• Record Type: Journal Article
• Authors: Alam, Mohd; Pal, Arkadeb; Anand, Khyati; Ghosh, Surajit; Tripathi, Saurabh; Singh, Ranjan K.; Ghosh, A. K.; Yang, H. D.; Chatterjee, Sandip
• Is Part Of: Europhysics letters. Volume 137:Number 2(2022)
• Publication Date: 2022-01-01
• Subjects: Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/ac2455
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: The temperature-dependent Raman spectroscopy and dielectric property of pyrochlore Eu2 Ti2 O7 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.