Structural, magnetic, transport and magnetocaloric properties of metamagnetic DyMn0.5Co0.5O3

Autor:	R. Pradheesh, C. Ganeshraj, P. N. Santhosh
Rok vydání:	2012
Předmět:	Magnetization Materials science Condensed matter physics Magnetoresistance Ferromagnetism Rietveld refinement Magnetic refrigeration General Physics and Astronomy Antiferromagnetism Metamagnetism Magnetic field
Zdroj:	Journal of Applied Physics. 111:07A914
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.3672067
Popis:	Rietveld refinement of the powder diffraction data revealed that DyMn0.5Co0.5O3 (DMCO) crystallized in an orthorhombic structure containing distorted Mn/Co−O6 octahedra (sp.gr = Pnma; a = 5.5922(1) A, b = 7.4987(1) A, c = 5.2606(1) A). Below 85 K, the field cooled magnetization data shows a spontaneous magnetic ordering. The metamagnetic behavior of the sample is evident from the nature of variation of magnetization with applied magnetic field. The field dependent magnetization at 5 K, points out the Mn and Co ions are aligned ferromagnetically, whereas Dy and Mn-Co sublattices are coupled antiferromagnetically. The magnitude of isothermal magnetic entropy change, |ΔSM|max is ∼ 9.30 J kg−1 K−1 in the vicinity of magnetic ordering of Dy3+for the field change of 7 T, is appreciable to consider DyMn0.5Co0.5O3 as a magnetic refrigerant at low temperatures. The temperature variation of electrical resistivity shows the highly insulating nature of the sample.
Databáze:	OpenAIRE
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