Pioneering work of the mechanism elucidation of a new type ferromagnet Ca(La)B_6 by ESR.

利用ESR阐明新型铁磁体Ca(La)B_6机理的开创性工作。

• 批准号: 13440105
• 负责人: KUNII Satoru
• 金额: $ 10.75万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440105/
• 关键词: new type ferromagnet; Ca(La)B_6; ESR

The surprising paper of a new-type of ferromagnet Ca(La)B_6 was reported in "Nature" at February,2000. There were many theoretical papers appeared since then, but an experimental paper was not appeared. The reason was that the sample preparation was very difficult, because the melting point is very high (-2,500℃), and the liquid phase and the gas phase are co-existing. We are overcoming the above problems, we succeeded the single crystals of Ca(La)B_6 by Aluminum-flux method. We found out, first time, the ferromagnetism of Ca(La)B_6 in Japan. Moreover, we elucidate the mechanism of the ferromagnetism by electron spin resonance (ESR). That is, the spins owing to ferromagnetism are strongly forced to stay in the disk plane by an anisotropy field. We conclude that spins in Ca(La)B_6 exist only within the surface layer of approximately 1.5 μm thick, and they feel strong surface magnetic anisotropy of an easy plane type.

2000年2月的“自然”报道了《 Ferromagnet CA》（LA）B_6的新型B_6的令人惊讶的论文。此后出现了许多理论论文，但没有出现实验性论文。原因是样品制备非常困难，因为熔点非常高（-2,500℃），并且液相和气相共存。我们正在克服上述问题，我们通过铝 - 升级方法成功了CA（LA）B_6的单晶。我们第一次发现日本的CA（LA）B_6的铁磁性。此外，我们通过电子自旋共振（ESR）阐明了铁磁性的机理。也就是说，由于铁磁性而引起的旋转强烈被迫通过各向异性场停留在磁盘平面上。我们包括CA（LA）B_6中的旋转仅存在于大约1.5μm厚的表面层中，并且它们感觉到易于平面类型的强烈表面磁动率。

项目成果

M.Akatsu et al.: "Trigonal Lattice Distortion and Ferro-Quadrupole Ordering in Phase IV of Ce_xLa_<1-x>B_6(x=0.75 and 0.70)."J.Phys.Soc.Jpn.. 72. 205-208 (2003)

M.Akatsu 等人：“Ce_xLa_<1-x>B_6(x=0.75 和 0.70) IV 相中的三角晶格畸变和铁四极有序。”J.Phys.Soc.Jpn.. 72. 205-208

M.Akatsu: "Trigonal Lattice Distortion and Ferro Quadrupole Ordering in Phase IV of Ce_xLa_<1-x>B_6 (x=0.75 and 0.70)"J.Phys.Soc.Jpn.. 72. 205-208 (2003)

M.Akatsu：“Ce_xLa_<1-x>B_6 (x=0.75 和 0.70) IV 相中的三角晶格畸变和铁四极有序”J.Phys.Soc.Jpn.. 72. 205-208 (2003)

T.Sakakibara: "Anomalous Uniaxial Pressure Effect on the Phase IV Ordering in Ce_xLa_<1-x>B_6"J.Phys.Soc.Jpn.. 71・Suppl.. 48-51 (2002)

T.Sakakibara：“异常单轴压力对 Ce_xLa_<1-x>B_6 中 IV 相有序性的影响”J.Phys.Soc.Jpn.. 71・Suppl.. 48-51 (2002)

N.E.Sluchauko: "Low-ternperature transport anisotropy and many-Body ettects in SmB_6"Phys. Rev. B. 64・15. 153103-153106 (2001)

N.E. Sluchauko：“SmB_6 中的低温传输各向异性和多体结构”Phys Rev. B. 153103-153106 (2001)

M.Saitoh: "Anomalous Spin Density Distribution in CeB_6"J.Phys.Soc.Jpn.. 71・10. 2369-2372 (2002)

M.Saitoh：“CeB_6 中的异常自旋密度分布”J.Phys.Soc.Jpn.. 71・10 (2002)