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arXiv 1506.06211cond-mat.str-elcond-mat.supr-con
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化学压力和外压对$R$ CoPO($R$ = La,Pr,Nd,Sm)磁性的共同影响。II

Common effect of chemical and external pressures on the magnetic properties of $R$CoPO ($R$ = La, Pr, Nd, Sm). II

G. Prando, G. Profeta, A. Continenza, R. Khasanov, A. Pal, V. P. S. Awana, B. Büchner, S. Sanna

摘要:

利用μ子自旋谱和{ \it ab-initio}计算研究了不同稀土离子($R$ = La,Pr,Nd,Sm)掺杂的磷属元素氧化物$R$ CoPO中Co带铁磁性与结构参数的直接对应关系,补充了我们以前发表的结果[G. Prando { \it等人},{ \it Phys. Rev. B} { \bf 87},064401(2013)]。发现到铁磁相$T_{_{\textrm{C}}}$的转变温度和结晶晶胞$V$的体积都可以通过$R$离子半径和/或外部压力方便地调谐。报告了$T_{_{\textrm{C}}}$和$V$之间的线性相关性,并且{ \it ab-initio}计算明确地证明了化学压力和外部压力的完全等效性。因此,$R$离子被证明是影响铁磁相仅通过诱导的结构收缩,而不涉及任何积极的作用,从电子$f$自由度,这只是在低得多的温度下给出了相当大的磁贡献。

英文摘要:

The direct correspondence between Co band ferromagnetism and structural parameters is investigated in the pnictide oxides $R$CoPO for different rare-earth ions ($R$ = La, Pr, Nd, Sm) by means of muon-spin spectroscopy and {\it ab-initio} calculations, complementing our results published previously [G. Prando {\it et al.}, {\it Phys. Rev. B} {\bf 87}, 064401 (2013)]. Both the transition temperature to the ferromagnetic phase $T_{_{\textrm{C}}}$ and the volume of the crystallographic unit cell $V$ are found to be conveniently tuned by the $R$ ionic radius and/or external pressure. A linear correlation between $T_{_{\textrm{C}}}$ and $V$ is reported and {\it ab-initio} calculations unambiguously demonstrate a full equivalence of chemical and external pressures. As such, $R$ ions are shown to be influencing the ferromagnetic phase only via the induced structural shrinkage without involving any active role from the electronic $f$ degrees of freedom, which are only giving a sizeable magnetic contribution at much lower temperatures.

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