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arXiv 0906.5199cond-mat.str-elcond-mat.other
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SrRu_{1-x} Mn_xO_3铁磁和反铁磁相的Specific-heat研究

Specific-heat study for ferromagnetic and antiferromagnetic phases in SrRu_{1-x}Mn_xO3

A. Yamaji, M. Yokoyama, Y. Nishihara, Y. Narumi, K. Kindo

摘要:

用比热C_p测量方法研究了SrRu_{1-x} Mn_xO_3(x <= 0.6)的低温电子态。我们发现,在SrRuO_3的铁磁转变温度C_p中观察到的一个跳跃反常峰,在Mn取代Ru仅5%时就变成了一个宽峰。随着Mn的进一步掺杂,低温电子比热系数γ从x=0时的值(33 mJ/K^2 mol)显著降低,这与FM相的抑制以及电阻率的提高有关。当x >= 0.4时,γ接近~ 5 mJ/K^2 mol或更小,此时产生了具有绝缘电阻特征的反铁磁有序。这些结果表明,掺杂Mn引起的电子态的无序和重构与磁性基态和输运性质耦合。

英文摘要:

Low-temperature electronic states in SrRu_{1-x}Mn_xO_3 for x <= 0.6 have been investigated by means of specific-heat C_p measurements. We have found that a jump anomaly observed in C_p at the ferromagnetic (FM) transition temperature for SrRuO_3 changes into a broad peak by only 5% substitution of Mn for Ru. With further doping Mn, the low-temperature electronic specific-heat coefficient gamma is markedly reduced from the value at x=0 (33 mJ/K^2 mol), in connection with the suppression of the FM phase as well as the enhancement of the resistivity. For x >= 0.4, gamma approaches to ~ 5 mJ/K^2 mol or less, where the antiferromagnetic order with an insulating feature in resistivity is generated. We suggest from these results that both disorder and reconstruction of the electronic states induced by doping Mn are coupled with the magnetic ground states and transport properties.

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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