| Original Articles |
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Jahn-Teller Distortions Cooperating with Magnetic Interaction in
the Raman Spectra of La0.75Ca0.25MnO3 Thin Film |
| LIU Yong;LI Guang;FENG Shuang-Jiu;LI Xiao-Guang |
| Structure Research Laboratory, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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LIU Yong, LI Guang, FENG Shuang-Jiu et al 2003 Chin. Phys. Lett. 20 1603-1606 |
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Abstract Remarkable changes (additional peaks, frequency shift, and peak width) of Raman spectra of a La0.75Ca0.25MnO3 thin film have been observed during the paramagnetic insulator-ferromagnetic metal transition. The v1 band (230 cm-1) hardens by lattice contraction as a result of the rearrangement of MnO6 octahedra. The Jahn-Teller distortions seem to be responsible for the broadening of v2 band (485 cm-1) above the magnetic transition temperature TC. It is proposed that the 438 cm-1 vibration mode activated in the magnetic ordering state is associated with the rearrangement of MnO6 octahedra. The softening of v3 band (610 cm-1) below TC can be ascribed to the magnetic interaction that brings into spin-phonon coupling terms.
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| Keywords:
78.30.Hv
63.20.Kr
71.30.+h
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Published: 01 September 2003
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| PACS: |
78.30.Hv
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(Other nonmetallic inorganics)
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63.20.Kr
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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