High field magnetism and magnetoacoustics in UCu.sub.0.95./sub.Ge

0380459 - FZÚ 2013 RIV NL eng J - Journal Article
Zvyagin, A.A. - Yasin, S. - Skourski, Y. - Andreev, Alexander V. - Zherlitsyn, S. - Wosnitza, J.
High field magnetism and magnetoacoustics in UCu_0.95Ge.
Journal of Alloys and Compounds. Roč. 528, JUL (2012), s. 51-57. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA ČR GAP204/12/0150
Grant - others:EuroMagNET(XE) 228043
Institutional research plan: CEZ:AV0Z10100520
Keywords : uranium intermetallics * single crystals * antiferromagnetism * high fields * acoustics * magnetoelasticity
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.390, year: 2012

Magnetic and magneto-acoustic characteristics of UCu0.95Ge with antiferromagnetic ground state have been studied 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 B per formula unit. These field-induced transitions as well as the spontaneous transition at the magnetic ordering at TN = 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 UCu0.95Ge.
Permanent Link: http://hdl.handle.net/11104/0211167