Research of an origin of the unusual anomalous Hall Effect in ferromagnetic metals with a non-collinear

本文研究了具有非共线磁性结构的金属磁体CrTe_<1-x>Sb_x中异常霍尔效应异常行为的来源。CrTe_<1-x>Sb_x具有nias型结构。CrTe是铁磁性的，CrSb是反铁磁性的。CrTe_<1-x>Sb_x为0.25 ×小于或相似× ×小于或相似× 0.7时，在低温下形成倾斜自旋结构。CrTe_<1-x>Sb_x的霍尔电阻率p_H表现出非常规的温度依赖性1。测定了CrTe_<1-x>Sb_x （x=0.3 ~ 0.5）多晶样品在室温至10 K范围内的电阻率p。观测到的电阻率随温度T的降低而单调减小。p_H的非常规温度依赖性似乎与倾斜自旋结构的出现有关。当x=0.3和0.4时，CrTe_<1-x>Sb_x单晶生长。已经获得了小的片状单晶，但其质量不足以测量其磁性和输运性质。对CrTe_<1-x>的x=0.3和0.4的Sb_x进行了粉末中子衍射。铁磁矩M的温度依赖性在转变温度附近没有明显变化，在转变温度下，倾斜自旋结构随着t的减小而出现，这表明p_H复杂的温度依赖性并非源于M的温度依赖性。

We investigate an origin of the unusual behavior of the anomalous Hall Effect in metallic magnet CrTe_<1-x>Sb_x with a non-collinear magnetic structure. CrTe_<1-x>Sb_x has a NiAs-type structure. CrTe is ferromagnetic and CrSb is antiferromagnetic. In CrTe_<1-x>Sb_x with 0.25【less than or similar】x【less than or similar】0.7, a canted spin structure is formed at low temperatures. The Hall resistivity p_H of CrTe_<1-x>Sb_x shows unconventional temperature dependence1.The resistivity p of polycrystalline samples of CrTe_<1-x>Sb_x of x=0.3〜0.5 has been measured from room temperature to 10 K. The observed resistivity decreases monotonously with decreasing temperature T for all samples. It is plausible that the unconventional temperature dependence of p_H is related to the appearance of the canted spin structure.2.Single crystal growth of CrTe_<1-x>Sb_x has been performed for x=0.3 and 0.4. Small plate-like single crystals have been obtained but their quality is not enough to measurements of the magnetic and transport properties.3.Powder neutron diffraction has been performed for CrTe_<1-x>Sb_x of x=0.3 and 0.4. Temperature dependence of ferromagnetic moments M does not exhibit significant change around transition temperatures at which the canted spin structure appears with decreasing T. The fact indicates that the complicated temperature dependence of p_H does not stem from the temperature dependence of M.