EuSnP: a novel antiferromagnet with two-dimensional, corrugated Sn sheets
EuSnP: a novel antiferromagnet with two-dimensional, corrugated Sn sheets
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EuSnP：一种具有二维波纹锡片的新型反铁磁体
DOI：
10.1016/s0925-8388(02)00235-9
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
P. Klavins
中科院分区：
文献类型：
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作者：
A. C. Payne;Angella E. Sprauve;A. P. Holm;M. Olmstead;S. Kauzlarich;P. Klavins
在TiN助熔剂中生长了EuSnP大单晶。EuSnP的晶体结构为NbCrN结构。在T=130K(Z=2，r1=0.0382，wr2=0.1002)时，该化合物为四方晶系，空间群为P4/nMm，晶格常数为a=4.2783(6)ä和c=8.762(2)ä。单晶随温度变化的磁化率测量表明，EuSnP是一种Néel温度为21K的反铁磁体。高温顺磁数据符合居里-魏斯定律，并与Eu离子的2+价和7个未配对电子的指认相一致。Néel温度以下的磁化率是各向异性的，当磁场垂直于晶体c轴时，显示出亚磁相变。在Néel温度以下发生自旋重取向，在2K下的临界场Hc=1.5特斯拉，随温度变化的电阻率表明，在磁有序温度下，金属行为具有负磁阻转变。这种转变被磁场抑制了。
Large single crystals of EuSnP were grown from a tin flux. The crystal structure of EuSnP is the NbCrN structure type. The new compound crystallizes in the tetragonal system, space group P4/nmm, with the lattice constants a=4.2783(6) Å and c=8.762(2) Å, at T=130 K (Z=2, R1=0.0382, wR2=0.1002). Temperature-dependent magnetic susceptibility measurements on single crystals indicate that EuSnP is an antiferromagnet with a Néel temperature of 21 K. The high temperature paramagnetic data can be fit to a Curie–Weiss law and are consistent with the assignment of a 2+ valence to the Eu ions, seven unpaired electrons. The magnetic susceptibility below the Néel temperature is anisotropic, showing a metamagnetic transition when the field is applied perpendicular to the crystallographic c axis. A spin-reorientation occurs below the Néel temperature with an applied critical field, Hc=1.5 Tesla at 2 K. Temperature dependent resistivity indicates metallic behavior with a negative magnetoresistive transition at the magnetic ordering temperature. This transition is suppressed with magnetic field.