Magnetic and electrical properties of the ternary compound U2Ir3Si5 with one-dimensional uranium zigzag chains
Magnetic and electrical properties of the ternary compound U2Ir3Si5 with one-dimensional uranium zigzag chains
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DOI：
10.1103/physrevb.99.054408
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发表时间：
2019-02
影响因子：
3.7
通讯作者：
Dexin Li;F. Honda;A. Miyake;Y. Homma;Y. Haga;A. Nakamura;Y. Shimizu;A. Maurya;Yoshi-ichi Sato;M. Tokunaga;D. Aoki
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文献类型：
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作者：
Dexin Li;F. Honda;A. Miyake;Y. Homma;Y. Haga;A. Nakamura;Y. Shimizu;A. Maurya;Yoshi-ichi Sato;M. Tokunaga;D. Aoki
通过磁化率、比热、电阻率和高场磁化强度测量研究了一种新型斜方结构三元铀化合物单晶的物理性质。在K处发生反铁磁转变，然后在K处发生一级相变。 at处的尖峰和a处及其周围明显的滞后行为为一级相变提供了有力的证据。沿轴的测量结果揭示了在很宽的温度范围内电阻的负温度系数，这可以根据类半导体窄带隙模型或近藤效应来理解。沿轴在 4.2 K 处测量的曲线显示出在 200 kOe 左右的窄磁场区域内的三步变磁转变，并且在第一个转变场附近存在大磁滞，而 和 曲线显示高达 560 kOe 时没有转变，表明存在强磁各向异性。一阶相变的一个可能机制是由准一维铀锯齿链产生的磁性四极有序的发生。
The physical properties of the single-crystalline, a new ternary uranium compound with-type orthorhombic structure, are investigated by means of magnetic susceptibility, specific heat, electrical resistivity, and high-field magnetizationmeasurements.undergoes an antiferromagnetic transition atK followed by a first-order phase transition atK. The sharp peak inatand the obvious hysteresis behavior in, andaroundprovide strong evidence for the first-order phase transition. Themeasurements along theandaxes reveal the negative temperature coefficients of resistance over a wide temperature range, which can be understood based on the semiconductorlike narrow band gap model or the Kondo effect. Thecurve measured at 4.2 K along theaxis shows three-step metamagnetic transitions within a narrow field region around 200 kOe and a large hysteresis near the first transition field, while theandcurves show no transitions up to 560 kOe suggesting the strong magnetic anisotropy. A possible mechanism of the first-order phase transition atis the occurrence of a magnetic quadrupolar order, resulting from the quasi-one-dimensional uranium zigzag chain.