通过中子散射探索 ErB$_4$ 的磁相图

Simon Flury, Wolfgang J. Simeth, Danielle R. Yahne, Daniel G. Mazzone, Eric D. Bauer, Priscila F. S. Rosa, Romain Sibille, Oksana Zaharko, Dariusz J. Gawryluk, Marc Janoschek
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引用次数: 0

摘要

四方 $4f$ 电子金属间化合物 ErB$_4$ 的特征是沿四方 $c$ 轴的强 Ising 各向异性。铒位点上的磁矩可以映射到沙斯特里-萨瑟兰(SSL)晶格上,从而产生几何沮度。在零磁场条件下,ErB$_4$ 在低于 $T_\text{N} = 15.4$ K 时表现出平行柱状反铁磁性(CAFM)阶。分数磁化高原和其他奇异的自旋相是已被证实的自旋系统的特征。蒙特卡洛模拟提出,ErB$_4$是在$H_1$附近,介于CAFM和$M/M_\text{S}=1/2$高原(HP)相之间的自旋超固相的理想候选者。在这里,我们结合单晶中子衍射和非弹性中子散射来研究 ErB$_4$ 的磁相图和晶体电场(CEF)基态。我们对磁场函数的测量没有发现自旋超固相的特征,但使我们能够确定HP相的磁结构属于与伊辛材料一致的uuud类型。我们的非弹性中子散射测量所确定的 CEF 配置所预期的磁矩 $\mu_{\mathrm{CEF}$ $=$ 8.96 $\mu_B$ 也与中子衍射中观察到的有序磁矩一致,表明磁矩是完全有序的,并且接近于 Er$^{3+}$ 自由离子磁矩(9.6 $\mu_B$)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetic Phase Diagram of ErB$_4$ as Explored by Neutron Scattering
The tetragonal $4f$-electron intermetallic ErB$_4$ is characterized by strong Ising anisotropy along the tetragonal $c$ axis. The magnetic moments on the erbium sites can be mapped onto a Shastry-Sutherland (SSL) lattice resulting in geometrical frustration. At zero magnetic field ErB$_4$ exhibits collinear columnar antiferromagnetic (CAFM) order below $T_\text{N} = 15.4$ K. In the presence of a magnetic field parallel to the $c$ axis, ErB$_4$ exhibits a plateau at $1/2$ of the saturation magnetization $M_\text{S}$, which arises at a spin flip transition at $H_1$ $=$ 1.9 T. Fractional magnetization plateaus and other exotic spin phases are a well-established characteristic feature of frustrated spin systems. Monte Carlo simulations propose that ErB$_4$ is an ideal candidate to feature a spin supersolid phase in close vicinity of $H_1$ between the CAFM and $M/M_\text{S}=1/2$ plateau (HP) phase. Here we combine single-crystal neutron diffraction and inelastic neutron scattering to study the magnetic phase diagram and the crystal electric field (CEF) ground state of ErB$_4$. Our measurements as a function of magnetic field find no signature of the spin supersolid phase but allow us to determine the magnetic structure of the HP phase to be of the uuud type consistent with an Ising material. The magnetic moment $\mu_{\mathrm{CEF}}$ $=$ 8.96 $\mu_B$ expected from the CEF configuration determined by our inelastic neutron scattering measurements is also consistent with the ordered moment observed in neutron diffraction showing that the moments are fully ordered and close to the Er$^{3+}$ free ion moment (9.6 $\mu_B$).
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