硼
铁磁性
材料科学
磁化
等温过程
凝聚态物理
化学计量学
磁矩
载流子
磁场
化学
热力学
光电子学
物理化学
物理
量子力学
有机化学
作者
Jong‐Soo Rhyee,B. K. Cho
摘要
We present the consistent electronic and magnetic properties in high-quality defect-controlled single crystals of CaB6, based on temperature-dependent transport and isothermal magnetization. Pure CaB6 single crystals, synthesized with 99.9999%-pure boron, exhibited fully semiconducting characteristics, such as monotonic resistance for 2–300 K. Boron-related defects formed in CaB6 single crystals, synthesized with 99.9%-pure boron, induced extra free charge carriers. Remarkably, no ferromagnetic signals were detected from single crystals made with 99.9999%-pure boron, regardless of stoichiometry, whereas those made with 99.9%-boron exhibited ferromagnetism within a finite range of carrier density. This indicates that the boron-related defects generate both the local magnetic moments associated with the exotic ferromagnetism and extra free charge carriers.
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