论文标题
磁场诱导的eu磁矩在三角eumg2bi2和eumg2sb2的Neel温度下方的EU磁矩旋转
Magnetic-field-induced ab-plane rotation of the Eu magnetic moments in trigonal EuMg2Bi2 and EuMg2Sb2 single crystals below their Neel temperatures
论文作者
论文摘要
最近报道了三角eumg2bi2在Ab-Plane磁场HX和A型抗抗铁磁结构中的热力学和电子传输性能。在1.8 k <tn的温度下，旋转S = 7/2的欧盟磁矩保持在AB平面中，直至AB平面临界场hxc = 27.5 KOE，在该eu时，欧盟矩与HX平行。这里报道了在低场处进行的其他测量值，该测量揭示了在田间HC1 = 465 OE处的新旋转晶体转变，其中欧盟矩留在AB平面中，但垂直于HX。在较高的田地上，瞬间无法朝向田地，导致M成比例的HX至HXC。从发现HC1 = 220 OE的EUMG2SB2单晶的磁性特性的测量结果中报道了类似的结果。理论是对两种材料和相关各向异性的低场磁行为进行建模的理论。 EUMG2SB2中的AB平面三角各向异性明显小于EUMG2BI2中。
The thermodynamic and electronic-transport properties of trigonal EuMg2Bi2 in ab-plane magnetic fields Hx and the A-type antiferromagnetic structure have recently been reported. At a temperature of 1.8 K < TN, the Eu magnetic moments with spin S = 7/2 remain locked in the ab plane up to and above the ab-plane critical field Hxc = 27.5 kOe at which the Eu moments become parallel to Hx. Here additional measurements at low fields are reported that reveal a new spin-reorientation transition at a field Hc1 = 465 Oe where the Eu moments remain in the ab plane but become perpendicular to Hx. At higher fields, the moments cant towards the field resulting in M proportional to Hx up to Hxc. Similar results are reported from measurements of the magnetic properties of EuMg2Sb2 single crystals, where Hc1 = 220 Oe is found. Theory is formulated that models the low-field magnetic behavior of both materials, and the associated anisotropies are calculated. The ab-plane trigonal anisotropy in EuMg2Sb2 is found to be significantly smaller than in EuMg2Bi2.
