Zhang Fuxiang, Li Baizhuo, Ren Qingyong, Mao Huican, Xia Yuanhua, Hu Bingfeng, Liu Zichen, Wang Zhicheng, Shao Yeting, Feng Zhifa, Tan Shugang, Sun Yuping, Ren Zhi, Jing Qiang, Liu Bo, Luo Huiqian, Ma Jie, Mei Yuxue, Wang Cao, Cao Guang-Han
School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China.
Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China.
Inorg Chem. 2020 Mar 2;59(5):2937-2944. doi: 10.1021/acs.inorgchem.9b03294. Epub 2020 Feb 17.
Mn-based ZrCuSiAs-type pnictides ThMnPnN (Pn = P, As) containing PbO-type ThN layers were synthesized. The crystal and magnetic structures are determined using X-ray and neutron powder diffraction. While neutron diffraction indicates a C-type antiferromagnetic state at 300 K, the temperature dependence of the magnetic susceptibility shows cusps at 36 and 52 K respectively for ThMnPN and ThMnAsN. The susceptibility cusps are ascribed to a spontaneous antiferromagnetic-to-antiferromagnetic transition for Mn moments, which is observed for the first time in Mn-based ZrCuSiAs-type compounds. In addition, measurements of the resistivity and specific heat suggest an abnormal increase in the density of states at the Fermi energy. The result is discussed in terms of the internal chemical pressure effect.
合成了含有PbO型ThN层的Mn基ZrCuSiAs型磷化物ThMnPnN（Pn = P，As）。利用X射线和中子粉末衍射确定了晶体结构和磁结构。虽然中子衍射表明在300 K时为C型反铁磁态，但对于ThMnPN和ThMnAsN，磁化率的温度依赖性分别在36 K和52 K处出现尖点。这些尖点归因于Mn磁矩的自发反铁磁到反铁磁转变，这在Mn基ZrCuSiAs型化合物中首次观察到。此外，电阻率和比热的测量表明费米能处的态密度异常增加。根据内部化学压力效应讨论了该结果。
