Transport Properties of the Metallic Two-dimensional Triangular Antiferromagnet Ag2CrO2
Transport Properties of the Metallic Two-dimensional Triangular Antiferromagnet Ag2CrO2
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DOI：
10.1016/j.phpro.2015.12.083
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Kida;A. Okutani;H. Yoshida;M. Hagiwara
中科院分区：
文献类型：
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作者：
T. Kida;A. Okutani;H. Yoshida;M. Hagiwara
研究了金属二维三角形反铁磁化合物Ag_2CrO_2多晶样品的磁输运性质。该化合物的电阻率显示出金属行为，并在TN下突然下降。在TN以下，观察到几乎线性的正磁阻。另一方面，刚好在TN以上，在8 T下观察到-38%的大的负磁阻。负磁电阻的绝对值随温度的升高而减小。霍尔电阻随TN以下磁场的变化呈现非线性特性。这些结果表明，Ag_2CrO_2的输运性质与其特殊的反铁磁自旋结构密切相关.
We have investigated the magnetotransport properties of polycrystalline samples of Ag2CrO2, which is a metallic two-dimensional triangular antiferromagnetic compound (TN∼24 K). The electrical resistivity of this compound displayed metallic behavior and an abrupt decrease atTN. BelowTN, almost linear positive magnetoresistance was observed. On the other hand, just aboveTN, a large negative magnetoresistance of -38% at 8 T was observed. The absolute value of the negative magnetoresistance decreases with increasing temperature. The Hall resistance showed a nonlinear behavior as a function of the magnetic field belowTN. These results suggest that the transport properties of Ag2CrO2are closely related to its unusual antiferromagnetic spin-structure.