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arXiv 2103.04295cond-mat.mtrl-scicond-mat.str-el
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带填充调谐(Nd $_{1-x}$ Ca $_x$)$_2$ Mo $_2$ O $_7$的强非共面磁性

Robust noncoplanar magnetism in band filling-tuned (Nd$_{1-x}$Ca$_x$)$_2$Mo$_2$O$_7$

Max Hirschberger, Yoshio Kaneko, Leonie Spitz, Taro Nakajima, Yasujiro Taguchi, Yoshinori Tokura

摘要:

在金属烧绿石Nd $_2$ Mo $_2$ O $_7$中,导电钼子晶格采用倾斜但几乎共线的铁磁有序,具有非零标量自旋手征。化学势可以通过用Ca $^{2+}$取代Nd $^{3+}$来控制,同时仅向导电状态引入最小的额外无序。在这里,我们证明了倾斜的铁磁状态的稳定性,包括钼自旋的倾斜角,在(Nd $_{1-x}$ Ca $_{x}$)$_2$ Mo $_2$ O $_7$(NCMO)与$x\le 0.15$使用磁化率测量。Mo-Mo和Mo-Nd磁耦合在$x=0.22$以上都改变了符号,在那里倾斜的铁磁态让位于自旋玻璃金属区。系统地分离了两种磁性亚晶格对居里-外斯定律的贡献。

英文摘要:

In the metallic pyrochlore Nd$_2$Mo$_2$O$_7$, the conducting Molybdenum sublattice adopts canted, yet nearly collinear ferromagnetic order with nonzero scalar spin chirality. The chemical potential may be controlled by replacing Nd$^{3+}$ with Ca$^{2+}$, while introducing only minimal additional disorder to the conducting states. Here, we demonstrate the stability of the canted ferromagnetic state, including the tilting angle of Molybdenum spins, in (Nd$_{1-x}$Ca$_{x}$)$_2$Mo$_2$O$_7$ (NCMO) with $x\le 0.15$ using magnetic susceptibility measurements. Mo-Mo and Mo-Nd magnetic couplings both change sign above $x=0.22$, where the canted ferromagnetic state gives way to a spin-glass metallic region. Contributions to the Curie-Weiss law from two magnetic sublattices are separated systematically.

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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