Физика Низких Температур: Том 43, Выпуск 11 (Ноябрь 2017), c. 1575-1580    ( к оглавлению , назад )

High-field magnetoelasticity of Tm2Co17 and comparison with Er2Co17

A.V. Andreev1, A.A. Zvyagin2,3, Y. Skourski4, S. Yasin4,5, and S. Zherlitsyn4

1Institute of Physics, Academy of Sciences, Na Slovance 2, Prague 182 21, Czech Republic
E-mail: andreev@fzu.cz

2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine

3Max-Planck-Institut für Physik komplexer Systeme, 38 Nöthnitzrer Str., Dresden D-01187, Germany

4Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, Dresden D-01314, Germany

5American University of the Middle East, College of Engineering and Technology, Egaila 54200, Kuwait

Received February 24, 2017

Аннотация

Acoustic properties (ultrasound velocity and attenuation) and magnetostriction were measured in pulsed fields up to 60 T applied along the c axis of Tm2Co17 single crystal. Similar to Er2Co17, the transition in Tm2Co17 is accompanied by clear anomalies in the sound velocity. The observed 0.3% jump of the sound velocity at the transition is negative in Tm2Co17, whereas it is positive in Er2Co17. The magnetostriction at the transition also differs very much from that in Er2Co17. In Tm2Co17, the transition is accompanied by a smooth minimum of 0.15·10–4 in longitudinal magnetostriction whereas in Er2Co17 by a very sharp expansion of much largermagnitude (1.2·10–4). In the transverse mode, the effect in Tm2Co17 looks as very broad minimum of low amplitude (< 0.1·10–4) whereas in Er2Co17 as very sharp and large shrinkage (2.6·10–4). Thus, both themagnetoacoustics and magnetostriction are rather different in Tm2Co17 and Er2Co17. This supports different nature of the field-induced transitions in these compounds.

PACS: 62.65.+k Acoustical properties of solids;
PACS: 75.47.Np Metals and alloys;
PACS: 75.80.+q Magnetomechanical effects, magnetostriction.

Ключевые слова: intermetallic compounds, magnetoelasticity, magnetostriction.

Published online: September 25, 2017