论文标题
金属ti $ _4 $ mnbi $ _2 $的线性MN链中的相关性和初始抗铁磁序列
Correlations and incipient antiferromagnetic order within the linear Mn chains of metallic Ti$_4$MnBi$_2$
论文作者
论文摘要
我们报告了关于Ti $ _4 $ MNBI $ _2 $的测量值，其中涉及Mn离子线性链的晶体结构表明一维磁性特征。电阻率是金属的，这与电子结构计算的结果一致，该计算发现了稳健的费米表面，尽管具有中等的电子相关性。 curie-weiss适合磁化率，发现Mn矩处于低旋转$ s = 1/2 $配置。中子衍射测量值检测到MN链中的弱抗铁磁序，并进一步证明了与特定热量中与订购峰有关的熵以及自旋极化电子结构计算的结果。抗磁磁矩显然与$ d_ {x^{2} -y^{2}} $和$ d_ {xy} $ orbitals相关，而其余的Mn轨道被定位。强量子波动可能与形成MN力矩的电子不稳定性或与Ti $ _4 $ MNBI $ _2 $的一维特征有关的电子不稳定性有关，几乎可以克服磁性顺序。
We report measurements on Ti$_4$MnBi$_2$, where a crystal structure involving linear chains of Mn ions suggests one-dimensional magnetic character. The electrical resistivity is metallic, consistent with the results of electronic structure calculations that find a robust Fermi surface albeit with moderate electronic correlations. Curie-Weiss fit to the magnetic susceptibility finds that the Mn moments are in the low-spin $S = 1/2$ configuration. Neutron diffraction measurements detect weak antiferromagnetic order within the Mn chains, with further evidence for the small staggered moment coming from the entropy associated with the ordering peak in the specific heat as well as from the results of spin-polarized electronic structure calculations. The antiferromagnetic moments are apparently associated with the $d_{x^{2}-y^{2}}$ and $d_{xy}$ orbitals of Mn while the remaining Mn orbitals are delocalized. Strong quantum fluctuations, possibly related to an electronic instability that forms the Mn moment or to the one-dimensional character of Ti$_4$MnBi$_2$, nearly overcome magnetic order.
