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arXiv 1005.1935cond-mat.str-elcond-mat.other
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横向磁场中LiHoF4的膨胀研究

Dilatometric Study of LiHoF4 In a Transverse Magnetic Field

J. L. Dunn, C. Stahl, Y. Reshitnyk, W. Sim, R. W. Hill

摘要:

理论和实验工作还没有提供一个一致的图片的相图的近理想的伊辛铁磁体LiHoF 4在横向磁场。利用一种新制作的电容式磁致伸缩仪,研究了LiHoF_4在垂直于伊辛方向的磁场中的热膨胀和磁致伸缩。铁磁相变的临界点已确定从这两种方法在经典的顺磁铁磁制度。已经发现与现有的实验数据表明,在这种制度下,目前的理论计算还没有完全捕捉到这个有趣的模型系统的物理极好的协议。

英文摘要:

Theoretical and experimental work have not provided a consistent picture of the phase diagram of the nearly ideal Ising ferromagnet LiHoF4 in a transverse magnetic field. Using a newly fabricated capacitive dilatometer, we have investigated the thermal expansion and magnetostriction of LiHoF4 in magnetic fields applied perpendicular to the Ising direction. Critical points for the ferromagnetic phase transition have been determined from both methods in the classical paramagnetic to ferromagnetic regime. Excellent agreement has been found with existing experimental data suggesting that, in this regime, the current theoretical calculations have not entirely captured the physics of this interesting model system.

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