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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Hydrogenation inducing antiferromagnetism in the heavy-fermion ternary silicide CeRuSi
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Hydrogenation inducing antiferromagnetism in the heavy-fermion ternary silicide CeRuSi

机译：加重费米三元硅化物CeRuSi中的加氢诱导反铁磁性

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摘要

The hydride CeRuSiH_(1.0) with space group P4mm was synthesized by exposure at 523 K of the heavy-fermion ternary silicide CeRuSi under 4 MPa of hydrogen gas. The investigation of the hydride by x-ray powder diffraction reveals that the hydrogenation induces a pronounced anisotropic expansion of the unit cell. Moreover, CeRuSiH_(1.0) presents two antiferromagnetic transitions at T_(N1)=7.5(2) K and 7_(N2)=3.1(2) K evidenced by magnetization and specific heat measurements. Hydrogenation changes the moderate heavy-fermion compound CeRuSi, which has a γ=220 mJ/molK~2, to an antiferromagnet, which has a smaller electronic coefficient γ= 26 mJ/molK~2. In other words, the hydrogen insertion diminishes the influence of the Kondo effect. The transition heavy-fermion behavior→antiferromagnet can be well understood in terms of the classical Doniach diagram where the hydrogenation plays a role opposite to the pressure. The expansion of the lattice induced by hydrogen insertion is here much more important than the role of Ce-H bonding observed in other hydrogenated compounds CeCoSiH_(1.0) or CeCoGeH_(1.0), where an opposite transition (antiferromagnetic → spin fluctuation) was evidenced.
机译：通过在4 MPa的氢气下于523 K下暴露重金属三元硅化物CeRuSi，合成具有空间群P4 / nmm的氢化物CeRuSiH_（1.0）。通过X射线粉末衍射对氢化物的研究表明，氢化诱导了晶胞的明显的各向异性膨胀。此外，CeRuSiH_（1.0）在T_（N1）= 7.5（2）K和7_（N2）= 3.1（2）K处表现出两个反铁磁跃迁，通过磁化和比热测量证明。氢化将具有γ= 220 mJ / molK〜2的中等重铁化合物CeRuSi变成具有较小电子系数γ= 26 mJ / molK〜2的反铁磁体。换句话说，氢的插入减少了近藤效应的影响。从经典的Doniach图可以很好地理解过渡重铁离子行为→反铁磁体，其中氢化起着与压力相反的作用。与其他氢化化合物CeCoSiH_（1.0）或CeCoGeH_（1.0）中观察到的相反转变（反磁性→自旋涨落）中所观察到的Ce-H键的作用相比，氢插入引起的晶格扩展在这里要重要得多。

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