Magnetic Properties of the Frustrated fcc ?Antiferromagnet HoB₁₂ Above and Below T _N

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• 作者：K. Siemensmeyer ; K. Habicht ; Th. Lonkai ; S. Mat¡¯a? ; S. Gab¨¢ni ; N. Shitsevalova ; E. Wulf and K. Flachbart
• 关键词：dodecaborides ; neutron scattering ; magnetic ordering
• 刊名：Journal of Low Temperature Physics
• 出版年：2007
• 出版时间：March, 2007
• 年：2007
• 卷：146
• 期：5-6
• 页码：581-605
• 全文大小：932 KB

文摘

We have investigated the magnetic ordering of the frustrated fcc – antiferromagnet HoB₁₂. Below T_N= 7.4 K antiferromagnetic order and a complex phase diagram is observed. Above T_N neutron scattering experiments show strong diffuse scattering. The diffuse signal indicates strong correlations between rare earth moments along the [111] direction well above T_N. The behavior of this component resembles low dimensional magnets which are known to show long range order only at T = 0. Close to T_N correlations perpendicular to the [111] direction get relevant, they diverge toward T_N. Thus we observe a complex ordering process where the frustration is lifted in steps. The experimental data and their interpretation are presented, some of the possible microscopic origins are discussed.