Raman spectroscopy of (formula presented) near the paramagnetic-to-ferromagnetic phase transition

M. N. Iliev, A. P. Litvinchuk, H. G. Lee, C. L. Chen, M. L. Dezaneti, C. W. Chu, V. G. Ivanov, M. V. Abrashev, V. N. Popov

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70 引文 斯高帕斯(Scopus)

摘要

The polarized Raman spectra of (010)- and (001)-oriented epitaxial thin films of (Formula presented) (space group (Formula presented) (Formula presented)) are measured between 5 and 300 K. The Raman lines at 123, 225, 252, 291, 361, 390–393, and (Formula presented) are assigned to definite modes of (Formula presented) or (Formula presented) symmetry based of their polarization selection rules, the comparison with the results of lattice dynamical calculations (LDC), and accounting for the correlation between the Γ-point phonons in the (Formula presented) structure and the Γ-, (Formula presented)-, (Formula presented)-, and (Formula presented)-point phonon modes in the parent (Formula presented) structure. The pronounced anomalies of the Raman phonon parameters near the ferromagnetic transition (Formula presented) are discussed in terms of enhanced spin-phonon coupling and reorganization of the electronic states in the vicinity of (Formula presented).

原文English
頁(從 - 到)364-368
頁數5
期刊Physical Review B - Condensed Matter and Materials Physics
59
發行號1
DOIs
出版狀態Published - 1999

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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