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arXiv 1303.1607cond-mat.str-el
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几何阻挫Sm晶格的复磁性Phase Diagram:SmPd2Al3情形

Complex Magnetic Phase Diagram of a Geometrically Frustrated Sm Lattice: SmPd2Al3 case

Jiří Pospíšil, Gwilherm Nénert, Seiji Miyashita, Hideaki Kitazawa, Yuri Skourski, Martin Diviš, Jan Prokleška, Vladimír Sechovský

摘要:

用磁力计和中子衍射研究了SmPd_2Al_3单晶的磁性。SmPd 2Al 3代表了Sm磁性的一个独特的例子,在低温下表现出复杂的磁行为,在3.4、3.9、4.3和12.5 K下具有四个连续的磁相变。该化合物丰富的磁性相图反映了Sm ~(3+)离子的特殊性质,即基态多重态J = 5/2和第一激发多重态J = 7/2的能量接近性以及强晶场的影响。因此,观察到与理论Sm 3+自由离子值相比,Sm磁矩显著降低。尽管天然钐对中子有很强的吸收,Sm的磁矩很小(~ 0.2 μB),我们还是成功地测定了12.5 - 4.3K温度区间内相的磁k矢量(1/3,1/3,0)。这一观察将SmPd 2Al 3化合物归类为磁阻挫系统。磁化强度的动力学效应诱导了具有各种亚稳态的复杂磁结构,进一步说明了这种材料的复杂磁行为。

英文摘要:

Magnetism in SmPd2Al3 was investigated on a single crystal by magnetometry and neutron diffraction. SmPd2Al3 represents a distinctive example of the Sm magnetism exhibiting complex magnetic behavior at low temperatures with four consecutive magnetic phase transitions at 3.4, 3.9, 4.3 and 12.5 K. The rich magnetic phase diagram of this compound reflects the specific features of the Sm3+ ion, namely the energy nearness of the ground-state multiplet J = 5/2 and the first excited multiplet J = 7/2 in conjunction with strong crystal field influence. Consequently, a significantly reduced Sm magnetic moment in comparison with the theoretical Sm3+ free-ion value is observed. Despite the strong neutron absorption by natural samarium and the small Sm magnetic moment (~ 0.2 μB) we have successfully determined the magnetic k-vector (1/3, 1/3, 0) of the phase existing in the temperature interval 12.5 - 4.3 K. This observation classifies the SmPd2Al3 compound as a magnetically frustrated system. The complex magnetic behavior of this material is further illustrated by kinetic effects of the magnetization inducing rather complicated magnetic structure with various metastable states.

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