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Pr doped rare-earth orthoferrites DyFeO3 is synthesized by solid state reaction. X-ray diffraction shows that the lattice parameters of Dy1-xPrxFeO3increase and distortion of lattice decreases with Pr content x increasing. Raman spectroscopy reveals that the change of effective mass (meff) [meff=xmPr+(1-x)mDy] together with lattice structure change results in the shift of vibration modes. With the increase of Pr content, Raman modes of wave number less than 200 cm-1 remain constant, but the modes of wave number greater than 200 cm-1 decrease with Pr content increasing (except the mode B3u near 420 cm-1). The weak ferromagnetic ordering, created by Dzyaloshinsky-Moriya interaction, is reduced with doping level increasing. The interaction of rare earth ions with Fe3+ ion, together with the change of lattice distortion, results in the increasing of spin reorientation phase transition temperature when xx increasing to over 0.3.
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Keywords:
- rare-earth orthoferrites /
- spin reorientation /
- lattice distortion /
- Raman spectrum
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[3] Hur N, Park S, Sharma P A, Ahn J S, Guha S, Cheong S W 2004 Nature 429 392
[4] Ikeda N, Ohsumi H, Ohwada K, Ishii K, Inami T, Kakurai K, Murakami Y, Yoshii K, Mori S, Horibe Y, Kitô H 2005 Nature 436 1136
[5] Wang J, Neaton J B, Zheng H, Nagarajan V, Ogale B, Liu B, Viehland D, Vaithyanathan V, Schlom D G, Waghmare U V, Spal-din N A, Rabe K M, Wuttig M, Ramesh R 2003 Science 299 1719
[6] Cheng Z X, Li A H, Wang X L, Dou S X, Ozawa K, Kimura H, Zhang S J, Shrout T R 2008 J. Appl. Phys. 103 07E507
[7] Fennie C J 2008 Phys. Rev. Lett. 100 167203
[8] Tokunaga Y, Iguchi S, Arima T, Tokura Y 2008 Phys. Rev. Lett. 101 097205
[9] Tokunaga Y, Taguchi Y, Arima T, Tokura Y 2012 Nature Phys. 8 838
[10] Dzyaloshinskii I 1958 J. Phys. Chem. Solids 4 241
[11] Moriya T 1960 Phys. Rev. 120 91
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[16] Guptake H C, Singh M K, Tiwari L M 2002 J. Raman Spectrosc. 33 67
[17] Venugopalan S, Dutta M, Ramdas A K, Remeika J P 1985 Phys. Rev. B 31 1490
[18] Traversa E, Nunziante P 2000 J. Am. Ceram. Soc. 85 108792
[19] Venugopalan S, Becker M M 1990 J. Chem. Phys. 93 15
[20] Rao G V S, Rao C N R 1970 Appl. Spectrosc. 24 4
[21] Hong F, Cheng Z X, Zhao H Y, Kimura H, Wang X L 2011 Appl. Phys. Lett. 99 092502
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