arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1404.6489cond-mat.str-elcond-mat.supr-con
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外压对$R$ CoAsO($R$ = La,Pr,Sm)磁性的影响:$μ$ SR研究

Effect of external pressure on the magnetic properties of $R$CoAsO ($R$ = La, Pr, Sm): a $μ$SR study

G. Prando, S. Sanna, R. Khasanov, A. Pal, E. M. Brüning, M. Mazzani, V. P. S. Awana, B. Büchner, R. De Renzi

摘要:

我们报告的巡游铁磁体LaCoAsO,PrCoAsO和SmCoAsO的详细调查进行的μ子自旋光谱的应用程序的外部流体静压$p$高达$2.4$ GPa的装置。这些材料被证明是磁硬的临界温度$T_{C}$和内部领域的弱依赖性的μ子网站上$p$。在$R$ = La和Sm的情况下,内场的行为在高达$p = 2.4$ GPa时基本上不变。一个更丰富的现象,而不是在PrCoAsO中检测到,可能与一个强大的$p$依赖的统计人口的两个不同的结晶网站的μ子。令人惊讶的是,结果与在同构化合物$R$ CoPO的情况下观察到的结果显著不同,其中完全的As/P取代已经在晶格内诱导强化学压力,但是$p$在进一步影响磁性方面仍然非常有效。

英文摘要:

We report on a detailed investigation of the itinerant ferromagnets LaCoAsO, PrCoAsO and SmCoAsO performed by means of muon spin spectroscopy upon the application of external hydrostatic pressures $p$ up to $2.4$ GPa. These materials are shown to be magnetically hard in view of the weak dependence of both critical temperatures $T_{C}$ and internal fields at the muon site on $p$. In the cases $R$ = La and Sm, the behaviour of the internal field is substantially unaltered up to $p = 2.4$ GPa. A much richer phenomenology is detected in PrCoAsO instead, possibly associated with a strong $p$ dependence of the statistical population of the two different crystallographic sites for the muon. Surprisingly, results are notably different from what is observed in the case of the isostructural compounds $R$CoPO, where the full As/P substitution is already inducing a strong chemical pressure within the lattice but $p$ is still very effective in further affecting the magnetic properties.

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