Seeded growth from flux and neutron study of La1-xBaxMnO3 (0.2 < x < 0.5) single crystals

被引：20
作者：
Barilo, SN
Bychkov, GL [1 ]
Kurnevich, LA
Shiryaev, SV
Kurochkin, LA
Lynn, JW
Vasiliu-Doloc, L
机构：
[1] Byelarussian Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Univ Maryland, Ctr Superconduct Res, College Pk, MD 20742 USA
来源：
JOURNAL OF CRYSTAL GROWTH | 2000年 / 211卷 / 1-4期
基金：
美国国家科学基金会;
关键词：
lanthanum-barium manganese oxide; flux growth; magnetoresistance; spin wave spectra;
D O I：
10.1016/S0022-0248(99)00767-8
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The flux technique for growing large crystals of La1-xBax MnO3(0.2 < x < 0.5) with a seed is discussed. Based on up to 40 wt% solubility of the solute, good rheological properties of corresponding flux melts, and desirable Ba substitution, the 25-40 mol% B2O3/45-60 mol% BaO/15-30 mol% BaF2 range of solvents has been selected to grow crystals up to 1.5 cm(3) in volume. The best crystals have been grown under constant or a very slow increase of temperature in the interval 950-1250 degrees C. Crystals with rocking curves of similar to 0.3 degrees FWHM have been obtained. Layer-by-layer X-ray fluorescent analysis has confirmed a high homogeneity of Ba distribution in volume. Neutron triple-axis measurements have been done to study the spin dynamics of the La0.68Ba0.32MnO3 crystal. Resistivity and AC-susceptibility results show that the peak occurs at a temperature T-p well above T-c (= 336 K). The data support the assumption that charge ordering exists to pin carriers. (C) 2000 Elsevier Science B.V. All rights reserved.
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收藏
页码：480 / 484
页数：5
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