Geometric frustration in the cubic spinelsMAl2O4(M=Co, Fe, and Mn)
Geometric frustration in the cubic spinelsMAl2O4(M=Co, Fe, and Mn)
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DOI：
10.1103/physrevb.72.174404
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发表时间：
2005-11
影响因子：
3.7
通讯作者：
N. Tristan;J. Hemberger;A. Krimmel;H. K. Nidda;V. Tsurkan;A. Loidl
中科院分区：
文献类型：
--
作者：
N. Tristan;J. Hemberger;A. Krimmel;H. K. Nidda;V. Tsurkan;A. Loidl
对含、铁、锰、锌的化合物进行了X射线衍射、磁化率、电子自旋共振和热容研究。所有化合物均为立方尖晶石结构，晶位之间有轻微的反转，并呈现自旋玻璃样的基态，其冻结温度远低于居里-魏斯温度，表明强烈的几何受挫。在冻结温度以下，热容表现出温度依赖关系，正如最近在一些相关的几何受阻磁体中观察到的那样，与普通自旋玻璃预期的线性关系相反。的热容表现出额外的轨道贡献。在没有合作的Jahn-Teller扭曲的情况下，这指向轨道冻结。在有序矩的值减小和大的顺磁分量的情况下，反铁磁有序。
X-ray diffraction, magnetic susceptibility, electron-spin resonance, and heat-capacity investigations were performed oncompounds with, Fe, Mn, and Zn. All compounds crystallize in cubic spinel structurewith minor inversion betweenandsites.andreveal spin-glass-like ground states with freezing temperatures well below the Curie-Weiss temperatures indicating strong geometric frustration. Below the freezing temperatures, the heat capacities show atemperature dependence foras has recently been observed in some related geometrically frustrated magnets, in contrast to the linear dependence expected for common spin glasses. The heat capacity ofexhibits an additional orbital contribution. With the absence of a cooperative Jahn-Teller distortion, this points toward an orbital freezing.orders antiferromagnetically belowwith a reduced value of the ordered moment and a large paramagnetic component.