非化学计量比CeCuBi2中复杂的场诱导磁相和各向异性磁输运
Complex field-induced magnetic phases and anisotropic magnetotransport in off-stoichiometric CeCuBi2
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中文总结 AI 辅助
本研究通过对非化学计量比CeCuBi2单晶的结构、磁性及磁输运性质研究，揭示其为各向异性近藤反铁磁体，存在复杂场诱导磁相与强各向异性磁输运响应，为探索关联量子现象提供了潜在平台。
中文摘要 AI 辅助
我们对高度各向异性的非化学计量比CeCuBi2单晶的结构、角度依赖磁性和磁输运性质开展了详细研究。结果表明，CeCuBi2是一种各向异性近藤反铁磁体，表现出复杂的场诱导磁行为和异常的磁输运性质。磁化率和比热测量显示，该材料在奈尔温度TN=14K以下呈现反铁磁（AFM）有序，具有强各向异性和弱重费米子行为。电输运测量显示出高度各向异性的电阻率，且在47K附近存在宽峰，表明存在近藤驱动的重费米子行为。磁化测量揭示了多个场诱导的变磁相，而交流磁化率测量表明，在中间场诱导的磁态中存在慢自旋动力学和类自旋玻璃行为。此外，我们观察到大且强各向异性的磁输运响应，包括在300K、9T下约22%的室温磁电阻，以及各向异性磁电阻（AMR）值达到约10.9%的蝶形各向异性磁电阻。这些结果凸显了近藤关联、磁各向异性和场可调自旋构型之间的强相互作用，使CeCuBi2成为探索关联各向异性量子现象的潜在平台。
英文摘要
We report a detailed study on the structural, angle-dependent magnetic and magnetotransport properties of highly anisotropic off-stoichiometric CeCuBi2 single crystals. Our results reveal CeCuBi2 as an anisotropic Kondo antiferromagnet exhibiting complex field-induced magnetic behavior and unusual magnetotransport properties. Magnetic susceptibility and specific heat measurements reveal antiferromagnetic (AFM) ordering below TN = 14 K with strong anisotropy and weak heavy-fermion behavior. Electrical transport measurements show highly anisotropic resistivity and a broad hump around 47 K, indicative of Kondo-driven heavy-fermion behavior. Magnetization measurements reveal multiple field-induced metamagnetic phases, while AC susceptibility measurements indicate slow spin dynamics and spin-glass-like behavior in intermediate field-induced magnetic states. Furthermore, we observe large and strongly anisotropic magneto transport responses, including room-temperature magnetoresistance of approximately 22% at 300 K and 9 T and butterfly-like anisotropic magnetoresistance with AMR values reaching approximately 10.9%. These results highlight a strong interplay among Kondo correlations, magnetic anisotropy, and field-tunable spin configurations, making CeCuBi2 a possible platform for exploring correlated and anisotropic quantum phenomena.
