Study of spin-phonon coupling in LiFe1 - XMnxPO4olivines

Nguyen Thi Minh Hien, Joo Hee Chung, Xiang Bai Chen, Woo Jun Kwon, Chul Sung Kim, In Sang Yang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

LiFe1 - xMnxPO4 olivines are promising material for improved performance of Li-ion batteries. Spin-phonon coupling of LiFe1 - xMnxPO4 (x = 0, 0.3, 0.5) olivines is studied through temperature-dependent Raman spectroscopy. Among the observed phonon modes, the external mode at ~263 cm-1 is directly correlated with the motions of magnetic Fe2+/Mn2+ ions. This mode displays anomalous temperature-dependent behavior near the Néel temperature, indicating a coupling of this mode with spin ordering. As Mn doping increases, the anomalous behavior becomes clearly weaker, indicating the spin-phonon coupling quickly decreases. Our analyses show that the quick decrease of spin-phonon coupling is due to decrease of the strength of spin-phonon coupling, but not change of spin-ordering feature with Mn doping. Importantly, we suggest that the low electrochemical activity of LiMnPO4 is correlated with the weak spin-phonon coupling strength, but not with the weak ferromagnetic ground state. Our work would play an important role as a guide in improving the performances of future Li-ion batteries.

Original languageEnglish
Pages (from-to)1161-1165
Number of pages5
JournalJournal of Raman Spectroscopy
Volume46
Issue number11
DOIs
StatePublished - 1 Nov 2015

Keywords

  • electrochemical activity
  • internal/external mode
  • LiFeMnPO olivine
  • Raman spectroscopy
  • spin-phonon coupling

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