Colossal negative magnetoresistance in spin glass Na(Zn,Mn)Sb
Shuang Yu, Yi Peng, Guoqiang Zhao, Jianfa Zhao, Xiancheng Wang, Jun Zhang, Zheng Deng, Changqing Jin
Abstract
Abstract We report the study of magnetic and transport properties of polycrystalline and single crystal Na(Zn,Mn)Sb, a new member of “111” type of diluted magnetic materials. The material crystallizes into Cu 2 Sb-type structure which is isostructural to “111” type Fe-based superconductors. With suitable carrier and spin doping, the Na(Zn,Mn)Sb establishes spin-glass ordering with freezing temperature ( T f ) below 15 K. Despite lack of long-range ferromagnetic ordering, Na(Zn,Mn)Sb single crystal still shows sizeable anomalous Hall effect below T f . Carrier concentration determined by Hall effect measurements is over 10 19 cm –3 . More significantly, we observe colossal negative magnetoresistance (MR ≡ [ ρ ( H ) − ρ (0)]/ ρ (0)) of –94% in the single crystal sample.