التفاصيل البيبلوغرافية
| العنوان: |
Magnetic two-dimensional short-range order in hexagonal manganites. |
| المؤلفون: |
Lonkai, Th., Tomuta, D. G., Hoffmann, J.-U., Schneider, R., Hohlwein, D., Ihringer, J. |
| المصدر: |
Journal of Applied Physics; 5/15/2003, Vol. 93 Issue 10, p8191, 3p, 4 Black and White Photographs, 1 Diagram, 2 Charts, 1 Graph |
| مصطلحات موضوعية: |
MANGANITE, MANGANESE oxides, CRYSTALS, SUPERCONDUCTING quantum interference devices, MAGNETIZATION |
| مستخلص: |
Hexagonal manganites REMnO[SUB3] consist of layers of two-dimensional connected distorted MnO[SUB5] bipyramids separated by distorted layers of RE, leading to frustrated Mn[SUP3+] - O[SUP2-] - Mn[SUP3+] in-plane exchange paths (superexchange) and Mn[SUP3+]- O[SUP2-]- O[SUP2-] - Mn[SUP3+] interplane exchange paths (super-superexchange). We report single-crystal diffraction experiments (RE = Ho,Er,Y) indicating magnetic 2D short-range order up to temperatures of T = 150 K (T[SUBN] ∼ 74 K), and SQUID magnetization data (RE = Y) indicating short-range order up to at least 250 K. Fits of a model based on an extended mean-field theory to the single-crystal data show in-plane exchange about 3 orders of magnitude stronger than the interplane exchange, explaining the unusual strong deviation from the Curie-Weiss law of the SQUID magnetization data. [ABSTRACT FROM AUTHOR] |
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