Magnetic ordering temperatures in rare earth metal dysprosium under ultrahigh pressures
Magnetic ordering temperatures in rare earth metal dysprosium under ultrahigh pressures
复制标题
超高压下稀土金属镝的磁有序温度
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Y. Vohra
中科院分区：
文献类型：
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作者：
G. Samudrala;G. Tsoi;S. Weir;Y. Vohra
利用超灵敏电输运测量技术，研究了重稀土金属镝（Dy）在压力为69 GPa、温度为10 K条件下的磁有序温度。以往在高压下使用磁化率测量的研究只能在Dy的六方紧密堆积（hcp）相中追踪到7 GPa的磁有序温度。我们的研究表明，在hcp- sm相变中，磁有序温度突然下降80 K，然后逐渐下降，一直持续到17 GPa。随后，双hcp相的磁有序温度迅速升高，并最终在Dy的扭曲面中心立方相中趋于平稳。我们的研究重申，4f-壳仍然定位在Dy中，并且在高达69 GPa的压力下，没有磁矩损失或4f-壳离域。
Magnetic ordering temperatures in heavy rare earth metal dysprosium (Dy) have been studied using an ultrasensitive electrical transport measurement technique in a designer diamond anvil cell to a pressure of 69 GPa and a temperature of 10 K. Previous studies using magnetic susceptibility measurements at high pressures were able to track magnetic ordering temperature only till 7 GPa in the hexagonal close packed (hcp) phase of Dy. Our studies indicate that the magnetic ordering temperature shows an abrupt drop of 80 K at the hcp-Sm phase transition followed by a gradual decrease that continues till 17 GPa. This is followed by a rapid increase in the magnetic ordering temperatures in the double hcp phase and finally leveling off in the distorted face centered cubic phase of Dy. Our studies reaffirm that 4f-shell remains localized in Dy and there is no loss of magnetic moment or 4f-shell delocalization for pressures up to 69 GPa.