Magnetic and Magnetotransport Properties of Diluted Magnetic Semiconductor (Ga,Mn)Sb Crystals

Ganesan, K and Bhat, HL (2008) Magnetic and Magnetotransport Properties of Diluted Magnetic Semiconductor (Ga,Mn)Sb Crystals. In: Journal of Superconductivity and Novel Magnetism, 21 (7). pp. 391-397.

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Abstract

We report the magnetic and magnetotransport properties of Ga1−x Mn x Sb crystals grown with different Mn doping concentrations (x=0.01, 0.02, 0.03 and 0.04) by the horizontal Bridgman technique. A systematic reduction in lattice parameter with increase in Mn concentration is observed through X-ray diffraction studies. The crystals show negative magnetoresistance and anomalous Hall effect below 10 K. Anomalous Hall coefficient is negative and decreases with increasing Mn concentration. Temperature dependence on magnetization measurement shows a magnetic ordering below 10 K which could arise from GaMnSb alloy formation. Also, ferromagnetism is observed till room temperature due to the presence of MnSb clusters. Existence of MnSb clusters is verified through scanning electron microscopy. The carrier concentration increases with Mn doping and this results in decrease of resistivity. The observed magnetic and transport properties indicate the presence of ferromagnetic phase below 10 K in the studied system.

Item Type:	Journal Article
Publication:	Journal of Superconductivity and Novel Magnetism
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	GaMnSb;Ferromagnetic semiconductors;Magnetization;Anomalous Hall effect;Horizontal Bridgman method; Ferromagnetic-semiconductor hybrid system.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	15 Sep 2009 09:48
Last Modified:	19 Sep 2010 04:57
URI:	http://eprints.iisc.ac.in/id/eprint/17567

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