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arXiv 1609.08181cond-mat.mtrl-sci
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Negative Pressure对原型巡回磁铁MnSi的影响

Effect of Negative Pressure on the Prototypical Itinerant Magnet MnSi

C. Dhital, M. A Khan, M. Saghayezhian, W. A. Phelan, D. P. Young, R. Y. Jin, J. F. DiTusa

摘要:

研究了巡游磁性金属MnSi在Si位上Al和Ga替代后磁性和电荷输运性质的演变。我们观察到单位晶胞体积的增加,表明Al和Ga取代产生负化学压力。居里温度和有序矩都有显著的增加,这表明取代使磁性更具局部性。这种取代也增加了温度和磁场的范围,由于磁性特征的变化,skyrmion相是稳定的。在纯MnSi的行为和预期的本征反常霍尔效应,我们发现一个显着的温度依赖性的大小和符号的异常霍尔电导率常数在Al或Ga取代的样品。这种温度依赖性可能反映了自旋轨道耦合强度随温度的变化,这可能对螺旋和skyrmion状态产生重大影响。总的来说,我们观察到一个连续的演变的磁性和电荷输运性质,通过积极的负压力

英文摘要:

The evolution of the magnetic and charge transport properties of itinerant magnetic metal MnSi with the substitution of Al and Ga on the Si site is investigated. We observe an increase in unit cell volume indicating that both Al and Ga substitutions create negative chemical pressure. There are substantial increases in the Curie temperature and the ordered moment demonstrating that the substitutions give the magnetism a more local character. The substitutions also increase the range of temperature and field where the skyrmion phase is stable due to a change in the character of the magnetism. In contrast to the behavior of pure MnSi and expectations for the intrinsic anomalous Hall effect, we find a significant temperature dependence to the magnitude and sign of anomalous Hall conductivity constant in Al or Ga substituted samples. This temperature dependence likely reflects changes in the spin-orbit coupling strength with temperature, which may have significant consequences on the helical and skyrmion states. Overall, we observe a continuous evolution of magnetic and charge transport properties through positive to negative pressure

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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