High field magnetism and magnetoacoustics in UCu_0.95Ge

详细信息	查看全文 | 推荐本文 |

• 作者：A.A. Zvyagin^a ; ^b ; S. Yasin^c ; Y. Skourski^c ; A.V. Andreev^d ; ^{a.andreev@seznam.cz} ; ^{andreev@mag.mff.cuni.cz} ; S. Zherlitsyn^c ; J. Wosnitza^c
• 关键词：Uranium intermetallics ; Single crystals ; Antiferromagnetism ; High fields ; Acoustics ; Magnetoelasticity
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 July, 2012
• 卷：528
• 期：Complete
• 页码：51-57
• 文件大小：1250 K

摘要

Studies of magnetic and magneto-acoustic characteristics of the intermetallic compound UCu_0.95Ge with antiferromagnetic ground state have been performed on single crystals in pulsed magnetic fields up to 64 T applied along the main axes. Along the a axis, a first-order phase transition has been observed at 61 T. For the field applied along the c axis, the first-order phase transition occurs at a much lower magnetic field (38 T). In both directions, the magnetization trends to saturate at 1.35 渭_B per formula unit. These field-induced transitions as well as the spontaneous transition at the magnetic ordering at T_N = 48 K are accompanied by pronounced anomalies in the sound velocity and sound attenuation. The field-temperature phase diagrams are constructed for both directions of the magnetic field. The results of our theoretical analysis within the framework of the mean-field approximation qualitatively agree with the observed behavior of magnetic and magneto-acoustic characteristics of UCu_0.95Ge.