Strong magnetic coupling in a magnetically dilute f-electron insulator: A dysprosium boron-cluster compound

被引：6

作者：

Mori, T. ^{[1
,2
]}

Sahara, R. ^{[3
]}

Kawazoe, Y. ^{[3
]}

Yubuta, K. ^{[3
]}

Shishido, T. ^{[3
]}

Grin, Y. ^{[4
]}

机构：

[1] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

[2] Univ Tsukuba, Tsukuba, Ibaraki 3058577, Japan

[3] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

[4] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2013年 / 113卷 / 17期

关键词：

BORIDES;

D O I：

10.1063/1.4800945

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Unexpectedly strong magnetic coupling is observed in boride insulators containing the B-12 icosahedra as a structural unit. We have successfully synthesized Dy0.74B22C2N, which takes the RB22C2N-type crystal structure. The Dy phase was previously thought to not be possible to form. Spin glass-like behavior was observed with a broad peak in the zero field cooled (ZFC) magnetic susceptibility at T similar to 44 K, while a large divergence for ZFC and field cooled (FC) curves is observed. The Curie-Weiss constant is determined to be theta = -43.9 K, and this system is indicated to have the strongest magnetic coupling ever observed for any rare earth boride insulator. Electronic structure and chemical bonding calculations were also made. Conventional mechanisms for f-electron magnetism cannot explain the strong coupling observed, which further indicates that the B-12 icosahedra is functioning as a novel mediator of magnetic interaction. (C) 2013 AIP Publishing LLC

引用

页数：3