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K and Mn co-doped BaCd2As2: a hexagonal structured bulk diluted magnetic semiconductor with large magnetoresistance

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arxiv 1311.6097 v1 pith:MNNFFFM4 submitted 2013-11-24 cond-mat.str-el cond-mat.mtrl-scicond-mat.supr-con

Xiaojun Yang , Yuke Li , Pan Zhang , Hao Jiang , Yongkang Luo , Qian Chen , Chunmu Feng , Chao Cao
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Jianhui Dai Qian Tao Guanghan Cao Zhu-an Xu
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classification cond-mat.str-elcond-mat.mtrl-scicond-mat.supr-con
keywords hexagonalba1-ykycd2-xmnxas2bacd2as2bulkco-dopeddilutedlargemagnetic
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A bulk diluted magnetic semiconductor was found in the K and Mn co-doped BaCd2As2 system. Different from recently reported tetragonal ThCr2Si2-structured II-II-V based(Ba,K)(Zn,Mn)2As2, the Ba1-yKyCd2-xMnxAs2 system has a hexagonal CaAl2Si2-type structure with the Cd2As2 layer forming a honeycomb-like network. The Mn concentration reaches up to its x ? 0.4. Magnetization measurements show that the samples undergo ferromagnetic transitions with Curie temperature up to 16 K. With low coercive field less than 10 Oe and large magnetoresistence of about -70%, the hexagonal structured Ba1-yKyCd2-xMnxAs2 can be served as a promising candidate for spin manipulations.

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