Magnetocrystalline anisotropy in a single crystal of CeNiGe 2
Magnetocrystalline anisotropy in a single crystal of CeNiGe 2
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CeNiGe 2 单晶的磁晶各向异性
DOI：
10.1103/physrevb.66.054420
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发表时间：
2002
影响因子：
3.7
通讯作者：
J. Thompson
中科院分区：
文献类型：
--
作者：
M. Jung;N. Harrison;A. Lacerda;P. G. Pagliuso;J. Sarrao;J. Thompson
我们报道了对具有高度各向异性磁性和输运性质的单晶{{\mathm{CeNiGe}}{2}的测量。在室温下，2K时的磁化比$M(H\ensuremath{\parallel}b)/M(H\ensuremath{\perp}b)$约为18，室温下的电阻率比${\ensuremath{\rho}}_{\ensuremath{\parallel}b}/{\ensuremath{\rho}}_{\ensuremath{\perp}b}$约为70。证实了多晶样品在4 K和3 K时发生了两步反铁磁相变。沿b轴(易磁化轴)施加的磁场稳定了Ce离子之间的铁磁关联，并增强了载流子的跃迁。这导致沿b轴的大负磁电阻。
We report measurements on single crystals of orthorhombic ${\mathrm{CeNiGe}}_{2},$ which is found to exhibit highly anisotropic magnetic and transport properties. The magnetization ratio $M(H\ensuremath{\parallel}b)/M(H\ensuremath{\perp}b)$ at 2 K is observed to be about 18 at 4 T and the electrical resistivity ratio ${\ensuremath{\rho}}_{\ensuremath{\parallel}b}/{\ensuremath{\rho}}_{\ensuremath{\perp}b}$ is about 70 at room temperature. It is confirmed that ${\mathrm{CeNiGe}}_{2}$ undergoes a two-step antiferromagnetic transition at 4 and 3 K, as reported for polycrystalline samples. The application of magnetic field along the b axis (the easy magnetization axis) stabilizes a ferromagnetic correlation between the Ce ions and enhances the hopping of carriers. This results in large negative magnetoresistance along the b axis.