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结构的金属磁体CrTe_ Sb_x中反常霍尔效应的起源<1-x>。CrTe_<1-x>Sb_x具有NiAs型结构。CrTe是铁磁性的，CrSb是反铁磁性的。在<1-x>0.25[小于或相近]x[小于或相近]0.7的CrTe_ Sb_x中，在低温下形成倾斜自旋结构。CrTe_ Sb_x的霍耳电阻率p_H<1-x>具有非常规的温度依赖性。1.<1-x>在室温至10 K范围内测量了x=0.3 ~ 0.5的CrTe_ Sb_x多晶样品的电阻率p。对于所有样品，所观察到的电阻率随着温度T的降低而单调降低。这可能与自旋倾斜结构的出现有关。2.<1-x>在x=0.3和0.4的条件下生长了CrTe_ Sb_x单晶。获得了小片状单晶，但其质量不足以测量磁性和输运性质。3.对<1-x>x=0.3和0.4的CrTe_ Sb_x进行了粉末中子衍射。铁磁磁矩M随温度的变化在转变温度附近没有明显的变化，在转变温度处，随着T的降低，出现倾斜的自旋结构。事实表明，p_H复杂的温度依赖性并不是源于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.