Magnetic and magnetoelastic properties of UCo2Si2 as studied by high-field magnetization and ultrasound measurements

0394491 - FZÚ 2014 RIV US eng J - Journal Article
Andreev, Alexander V. - Yasin, S. - Skourski, Y. - Zvyagin, A.A. - Zherlitsyn, S. - Wosnitza, J.
Magnetic and magnetoelastic properties of UCo2Si2 as studied by high-field magnetization and ultrasound measurements.
Physical Review. B. Roč. 87, č. 21 (2013), "214409-1"-"214409-8". ISSN 1098-0121
R&D Projects: GA ČR GAP204/12/0150
Grant - others:EU EuroMagNET(XE) 228043
Institutional support: RVO:68378271
Keywords : uranium intermetallics * single crystals * antiferromagnetism * high fields * acoustics * magnetoelasticity
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.664, year: 2013

We investigated antiferromagnet UCo2Si2 by magnetization and ultrasound measurements in pulsed magnetic fields up to 60 T. It is found that the crystal UCo2Si2, which has the AF type-I magnetic structure in zero field below TN=83 K, undergoes the metamagnetic phase transition to ferrimagnetic structure ++- type. The transition occurs when the magnetic field is applied along the c axis at 45 T (at 1.5 K). The transition is extremely sharp and exhibits a small but non-negligible hysteresis. With increasing temperature, it becomes broader and vanishes at TN. In ultrasound measurements, the transition appears as anomalies in the sound velocity and attenuation. Our analysis suggests that the low-temperature changes in the sound velocity and attenuation are determined by exchange renormalization caused by the sound waves.
Permanent Link: http://hdl.handle.net/11104/0222693