凝聚态物理
反铁磁性
磁电阻
物理
几何挫折
相图
磁化
强相关材料
磁场
材料科学
电子
相(物质)
量子力学
作者
Ian A. Leahy,Keke Feng,Roei Dery,Ryan Baumbach,Minhyea Lee
出处
期刊:Physical review
日期:2022-09-22
卷期号:106 (9)
被引量:2
标识
DOI:10.1103/physrevb.106.094426
摘要
Magnetic frustration in metallic rare- earth lanthanides ($Ln$) with $4f$ electrons is crucial for producing interesting magnetic phases with high magnetic anisotropy where intertwined charge and spin degrees of freedom lead to novel phenomena. Here we report on the magnetic, thermodynamic, and electrical transport properties of ${\mathrm{TbAuAl}}_{4}{\mathrm{Ge}}_{2}$. Tb ions form two-dimensional triangular lattice layers which stack along the crystalline $c$ axis. The magnetic phase diagram reveals multiple nearly degenerate ordered states upon applying field along the magnetically easy $ab$-plane before saturation. The magnetoresistance in this configuration exhibits intricate field dependence that closely follows that of the magnetization while the specific heat reveals a region of highly enhanced entropy, suggesting the possibility of a nontrivial spin textured phase. For fields applied along the $c$ axis (hard axis), we find linear magnetoresistance over a wide range of fields. We compare the magnetic properties and magnetoresistance with an isostructural ${\mathrm{GdAuAl}}_{4}{\mathrm{Ge}}_{2}$ single crystal. These results identify ${\mathrm{TbAuAl}}_{4}{\mathrm{Ge}}_{2}$ as an environment for complex quantum spin states and pave the way for further investigations of the broader $Ln{\mathrm{AuAl}}_{4}{\mathrm{Ge}}_{2}$ family of materials.
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