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ThMnPnN (Pn = P, As): Synthesis, Structure, and Chemical Pressure Effects
journal contribution
posted on 2020-02-16, 12:13 authored by Fuxiang Zhang, Baizhuo Li, Qingyong Ren, Huican Mao, Yuanhua Xia, Bingfeng Hu, Zichen Liu, Zhicheng Wang, Yeting Shao, Zhifa Feng, Shugang Tan, Yuping Sun, Zhi Ren, Qiang Jing, Bo Liu, Huiqian Luo, Jie Ma, Yuxue Mei, Cao Wang, Guang-Han CaoMn-based
ZrCuSiAs-type pnictides ThMnPnN (Pn = P, As) containing PbO-type Th2N2 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 Mn2+ 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.
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300 KmeasurementX-raysusceptibility cuspsresistivityChemical Pressure Effects Mn-based ZrCuSiAs-type pnictides ThMnPnNneutron diffractiondensityThMnPNThMnAsNSynthesiMn-based ZrCuSiAs-type compoundsantiferromagnetic-to-antiferromagnetic transitionPbO-type Th 2 N 2 layersmomentC-type antiferromagnetic statetermneutron powder diffractionchemical pressure effectcrystaltemperature dependence52 KFermi energy
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