Тип публикации: статья из журнала
Год издания: 2008
Идентификатор DOI: 10.1088/0953-8984/20/5/055217
Ключевые слова: Crystal structure, Magnetization, Manganese compounds, Phase interfaces, X ray diffraction, Manganese oxide, Space groups, Temperature range, Single crystals
Аннотация: A Pb(3)Mn(7)O(15) single crystal has been grown by the flux method and studied using x-ray diffraction and magnetization measurements. The crystal is hexagonal (P6(3)/mcm space group, Z = 4) and exhibits a pronounced layered nature. Along the  direction (c axis), the structure consists of layers of edge-sharing MnO(6) octahedra. Pairs of Mn atoms occupy the octahedral sites located between layers forming 'bridges' along the c axis, which link neighboring Mn layers. The magnetic properties of the crystal have been investigated using ac and dc magnetization measurements in the temperature range 2-900 K at magnetic fields up to 90 kOe. The experimental data obtained suggest that in the temperature region under study several different magnetic phases can be distinguished. Down to similar to 250 K, the crystal is in the paramagnetic state. Below this temperature, short-range antiferromagnetic ordering apparently starts forming within Mn layers, although a transition to long-range magnetic order occurs at 70 K. The magnetization data obtained leads us to conclude that this state is canted antiferromagnetic with moments lying in the basal plane of the crystal. In addition, below 20 K the crystal undergoes one more magnetic transition that corresponds to spin reorientation.
Журнал: JOURNAL OF PHYSICS-CONDENSED MATTER
Выпуск журнала: Vol. 20, Is. 5
ISSN журнала: 09538984
Место издания: BRISTOL
Издатель: IOP PUBLISHING LTD
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