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首页> 外文期刊>Journal of Physics. Condensed Matter >Negative pressure driven valence instability of Eu in cubic Eu_(0.4)La_(0.6)Pd_3
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Negative pressure driven valence instability of Eu in cubic Eu_(0.4)La_(0.6)Pd_3

机译：Eu在立方Eu_（0.4）La_（0.6）Pd_3中的负压驱动价不稳定性

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摘要

We report the change in the valency of Eu-ions in the binary intermetallic cubic compound EuPd_3 induced by La doping at rare-earth sites. Doping of La generates negative chemical pressure in the lattice, resulting in a significant increase of the lattice parameter without altering the simple-cubic structure of the compound. Results of dc-magnetic measurements suggest that this increase in the lattice parameter is associated with the valence transition of Eu-ions from Eu3+ to a mixed-valent state. As Eu~(2+)-ions possess a large magnetic moment, this valence transition significantly modifies the magnetic behavior of the compound. In contrast to introducing boron at the vacant body center site of the unit cell to change the valency of Eu-ions, as in the case of EuPd_3B, our results suggest it can also be altered by doping a rare-earth ion of larger size at the lattice site of Eu in EuPd_3.
机译：我们报告了稀土元素在La掺杂中引起的二元金属间立方化合物EuPd_3中Eu离子价态的变化。 La的掺杂会在晶格中产生负的化学压力，导致晶格参数显着增加，而不会改变化合物的简单立方结构。直流磁测量的结果表明，晶格参数的这种增加与Eu离子从Eu3 +到混合价态的化合价有关。由于Eu〜（2+）离子具有较大的磁矩，该价态跃迁极大地改变了化合物的磁性能。与在EuPd_3B的情况下将硼引入单位晶胞的空位中心位置以改变Eu离子的价位相反，我们的结果表明，也可以通过掺杂更大尺寸的稀土离子来改变它EuPd_3中Eu的晶格位点。

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