Seeded growth from flux and neutron study of La1−xBaxMnO3 (0.2
Autor:
Sergei N. Barilo, Jeffrey W. Lynn, S. V. Shiryaev, L. Vasiliu-Doloc, G. L. Bychkov, L. A. Kurochkin, L.A. Kurnevich
Rok vydání:
2000
Předmět:
Zdroj:
Journal of Crystal Growth. 211:480-484
ISSN:
0022-0248
DOI:
10.1016/s0022-0248(99)00767-8
Popis:
The flux technique for growing large crystals of La, -x Ba x MnO 3 (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% B 2 O 3 /45-60 mol% BaO/15-30 mol% BaF 2 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°C. Crystals with rocking curves of ∼ 0.3° 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 La 0.68 Ba 0.32 MnO 3 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.
Databáze:
OpenAIRE
Externí odkaz:
| Autor: | Sergei N. Barilo, Jeffrey W. Lynn, S. V. Shiryaev, L. Vasiliu-Doloc, G. L. Bychkov, L. A. Kurochkin, L.A. Kurnevich |
|---|---|
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Journal of Crystal Growth. 211:480-484 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/s0022-0248(99)00767-8 |
| Popis: | The flux technique for growing large crystals of La, -x Ba x MnO 3 (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% B 2 O 3 /45-60 mol% BaO/15-30 mol% BaF 2 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°C. Crystals with rocking curves of ∼ 0.3° 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 La 0.68 Ba 0.32 MnO 3 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect