arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.11488cond-mat.str-elcond-mat.mtrl-sci
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$α$ -Mn的压力-温度Phase Diagram

Pressure-Temperature Phase Diagram of $α$-Mn

Takaaki Sato, Kazuto Akiba, Shingo Araki, Tatsuo C. Kobayashi

摘要:

对高质量的$α$ -Mn单晶进行了高压下的电阻率和交流磁化率测量。压力-温度相图由反铁磁有序相(0< $P$ <1.4 GPa,$T<T_{\rm N}$)、压力诱导有序相(1.4< $P$ <4.2-4.4 GPa,$T<T_{\rm A}$)和顺磁相组成。在$T_{\rm A}$的交流磁化率的温度依赖性中观察到显著增加,表明压力诱导的有序相具有自发的磁矩。铁磁序和寄生铁磁性被认为是可能的磁性结构的候选者。在临界压力下,压力诱导的有序相消失,低于10 K的电阻率的温度依赖性与$T^{5/3}$成正比。这种非费米液体行为表明存在明显的磁波动。

英文摘要:

Electrical resistivity and ac-susceptibility measurements under high pressure were carried out in high-quality single crystals of $α$-Mn. The pressure-temperature phase diagram consists of an antiferromagnetic ordered phase (0<$P$<1.4 GPa, $T<T_{\rm N}$), a pressure-induced ordered phase (1.4<$P$<4.2-4.4 GPa, $T<T_{\rm A}$), and a paramagnetic phase. A significant increase was observed in the temperature dependence of ac-susceptibility at $T_{\rm A}$, indicating that the pressure-induced ordered phase has a spontaneous magnetic moment. Ferrimagnetic order and parasitic ferromagnetism are proposed as candidates for a possible magnetic structure. At the critical pressure, where the pressure-induced ordered phase disappears, the temperature dependence of the resistivity below 10 K is proportional to $T^{5/3}$. This non-Fermi liquid behavior suggests the presence of pronounced magnetic fluctuation.

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