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arXiv 1802.07360cond-mat.mtrl-sci
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Mn3Fe2Si3O12作为结晶石榴石和作为玻璃的磁性的比较

Comparison of the Magnetic properties of Mn3Fe2Si3O12 as a crystalline garnet and as a glass

F. Alex Cevallos, R. J. Cava

摘要:

结晶石榴石Mn 3Fe 2Si 3 O 12和相同标称组成的非晶相在高压下合成。两种形式的磁性报告。两相都是反铁磁有序的。晶相的居里-外斯θ为-47.2 K,在12 K处有一个尖锐的有序转变。玻璃相表现出较大的反铁磁居里-外斯θ,为-83.0 K,在2.5 K观察到宽的有序转变。这两个阶段可以被归类为磁挫折,虽然非晶相显示出更高程度的挫折。非晶相表现出自旋玻璃行为,并被确定为具有Mn 3Fe 2Si 3 O 13的实际组成。

英文摘要:

The crystalline garnet Mn3Fe2Si3O12 and an amorphous phase of the same nominal composition are synthesized at high pressure. The magnetic properties of the two forms are reported. Both phases order antiferromagnetically. The crystalline phase exhibits a Curie-Weiss theta of -47.2 K, with a sharp ordering transition at 12 K. The glassy phase exhibits a larger antiferromagnetic Curie-Weiss theta, of -83.0 K, with a broad ordering transition observed at 2.5 K. Both phases can be classified as magnetically frustrated, although the amorphous phase shows a much higher degree of frustration. The amorphous phase exhibits spin-glass behavior and is determined to have an actual composition of Mn3Fe2Si3O13.

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