Correlations and incipient antiferromagnetic order within the linear Mn chains of metallic Ti4MnBi2
Correlations and incipient antiferromagnetic order within the linear Mn chains of metallic Ti4MnBi2
复制标题
DOI：
10.1103/physrevb.102.014406
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Aronson MC
中科院分区：
文献类型：
--
作者：
Pandey A;Miao P;Klemm M;He H;Wang H;Qian X;Lynn JW;Aronson MC
我们报道了对Ti₄MnBi₂的测量结果，其中涉及锰离子线性链的晶体结构表明其具有一维磁性特征。电阻率呈金属性，这与电子结构计算的结果一致，该计算发现尽管存在适度的电子关联，但费米面很稳定。对磁化率进行居里 - 外斯拟合表明，锰磁矩处于低自旋S = 1/2组态。中子衍射测量检测到锰链内存在弱的反铁磁序，比热中与有序峰相关的熵以及自旋极化电子结构计算的结果进一步证明了交错磁矩很小。反铁磁矩显然与锰的\(d_{z^{2}}\)和\(d_{xy}\)轨道有关，而其余的锰轨道是离域的且无磁性。强烈的量子涨落，可能与形成锰磁矩的电子不稳定性或Ti₄MnBi₂的一维特性有关，几乎克服了磁序。
We report measurements on Ti4MnBi2, 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. A Curie-Weiss fit to the magnetic susceptibility suggests 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 and dxy orbitals of Mn while the remaining Mn orbitals are delocalized and nonmagnetic. Strong quantum fluctuations, possibly related to an electronic instability that forms the Mn moment or to the one-dimensional character of Ti4MnBi2, nearly overcome magnetic order.