AlB$_2$型硅化钬与锗化钬的磁性质
Magnetic properties of AlB$_2$-type holmium silicides and germanides
AI总结：
本研究合成了带空位的AlB$_2$型HoSi$_{1.67}$和HoGe$_{1.67}$，发现其反铁磁有序及磁熵变特性，并证实面内Ho$^{3+}$离子距离是影响其与HoB$_2$铁磁有序转变的关键参数。
摘要：
HoB$_2$中巨大磁热效应的发现突显了重稀土离子的实用优势。其他钬化合物也备受关注，我们在此报告了HoSi$_{1.67}$和HoGe$_{1.67}$的合成与磁性质，它们形成相同的AlB$_2$型结构但带有空位。研究发现它们表现出反铁磁有序，HoSi$_{1.67}$和HoGe$_{1.67}$的Neel温度分别为17.6(2)K和9.9(2)K，且该温度下的磁熵变分别为0.05(1)J/cm$^3$K和0.08(1)J/cm$^3$K。通过用镍填补空位，磁有序受到抑制，从而导致磁熵变增加。面内Ho$^{3+}$离子间的距离似乎是导致反铁磁（HoSi$_{1.67}$）与铁磁（HoB$_2$）有序之间转变的重要参数。这一发现可能有助于探索其他重稀土化合物在类似应用中的潜力。
英文摘要：
Discovery of the large magnetocaloric effect in HoB$_2$ has highlighted the practical advantage of heavy rare-earth ions. Other holmium compounds are of interest, and we here report the synthesis and the magnetic properties of HoSi$_{1.67}$ and HoGe$_{1.67}$ which form the same AlB$_2$-type structure but with vacancies. They are found to show the antiferromagnetic order with the Neel temperature 17.6(2)K for HoSi$_{1.67}$ and 9.9(2)K for HoGe$_{1.67}$, and the magnetic entropy changes at the temperature are 0.05(1)J/cm$^3$K for HoSi$_{1.67}$ and 0.08(1)J/cm$^3$K for HoGe$_{1.67}$. Magnetic orders were suppressed by replacing vacancies with nickel, resulting in an increase of magnetic entropy changes. Distance between the in-plane Ho$^{3+}$ ions appears to be an important parameter leading to the transition between the antiferromagnetic (HoSi$_{1.67}$) and the ferromagnetic (HoB$_2$) order. The finding may aid the exploration of other heavy rare-earth compounds for similar applications.
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。
