کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10653194 | 1002847 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vibrational anisotropy of Mn3+O6 octahedron and phase separation in La0.67âyPryCa0.33MnO3 manganites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The role of vibrational anisotropy of Mn3+O6 octahedron in the phase separation behavior of La0.67âyPryCa0.33MnO3 (x=0, 0.15, 0.25 and 0.30) has been investigated by means of magnetization M, internal friction Qâ1, Young's modulus E along with the X-ray powder diffraction measurements. For the samples with y=0 and 0.15, the Qâ1 exhibits three peaks in the ferromagnetic region, which are attributed to the intrinsic inhomogeneity of ferromagnetic phase, i.e. the electronic phase separation with the coexistence of insulating and conducting phases. However, both the samples with y=0.25 and 0.30 undergo a magnetic phase separation with the coexistence of the antiferromagnetic and ferromagnetic phases, and the Qâ1 peaks related to the electronic phase separation have not been observed. In addition, the Qâ1 exhibits a peak in the paramagnetic region for all samples, which may result from the formation of magnetic clusters. We observed that the evolution from electronic to magnetic phase separation is close related to the rapid increase in the ratio of two kinds of Jahn-Teller distortion modes Q3 and Q2, i.e. Q3/Q2. A schematic phase diagram is given in the text, and it is suggested that the enhancement of vibrational anisotropy of Mn3+O6 octahedron plays a key role in the evolution from electronic to magnetic phase separation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 135, Issue 6, August 2005, Pages 361-366
Journal: Solid State Communications - Volume 135, Issue 6, August 2005, Pages 361-366
نویسندگان
Y.Q. Ma, J. Yang, B.C. Zhao, R.L. Zhang, Z.G. Sheng, W.J. Lu, W.H. Song, J.J. Du, Y.P. Sun,