Magneto-acoustic properties of UCuGe single crystal

0343107 - FZÚ 2011 RIV US eng J - Journal Article
Yasin, S. - Andreev, Alexander V. - Sytcheva, A. - Wosnitza, J. - Zherlitsyn, S.
Magneto-acoustic properties of UCuGe single crystal.
Journal of Low Temperature Physics. Roč. 159, 1-2 (2010), 105-108. ISSN 0022-2291. E-ISSN 1573-7357
R&D Projects: GA ČR GA202/09/0339
Grant - others:EuroMagNET(XE) 228043
Institutional research plan: CEZ:AV0Z10100520
Keywords : ultrasound * UTX compounds * pulse fields * field-induced transition
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.403, year: 2010

Field and temperature dependence of sound-velocity and sound-attenuation were studied on a single crystal of the antiferromagnetic UCuGe (TN = 48 K). The temperature dependences of the sound velocity and attenuation display a pronounced anomaly at TN, which is evidence for a strong magneto-elastic interaction. The pulse-field measurements at 4.2 K show a minimum in the sound velocity followed by a jump-like anomaly at 37 T, and another kink-like anomaly at 48–49 T. These anomalies are due to field-induced spin rearrangements as measured in magnetization studies. In the paramagnetic state, both acoustic characteristics show large frequency-dependent changes revealing the presence of an unusual relaxation mechanism which might be due to vacancy dynamics.
Permanent Link: http://hdl.handle.net/11104/0185660