Pressure-induced itinerant electron metamagnetism in UCo0.995Os0.005Al ferromagnet

0490189 - FZÚ 2019 RIV NL eng J - Journal Article
Mushnikov, N. V. - Andreev, Alexander V. - Arnold, Zdeněk
Pressure-induced itinerant electron metamagnetism in UCo0.995Os0.005Al ferromagnet.
Physica B-Condensed Matter. Roč. 536, May (2018), s. 522-526. ISSN 0921-4526. E-ISSN 1873-2135
R&D Projects: GA ČR GA16-03593S; GA ČR GA15-03777S
Institutional support: RVO:68378271
Keywords : uranium intermetallics * UCoAl * itinerant electron metamagnetism * ferromagnetism * pressure effects
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.874, year: 2018

The effect of external hydrostatic pressure on magnetic properties is studied for the UCo0.995Os0.005Al single crystal. At ambient pressure, the ground state is ferromagnetic. Even lowest applied pressure 0.11 GPa is sufficient to suppress ferromagnetism. A sharp metamagnetic transition is observed only in magnetic fields along the c axis of the crystal, similar to previously studied itinerant electron metamagnet UCoAl. Temperature dependence of the susceptibility for various pressures shows a broad maximum at T-max similar to 20 K. The experimental data are analyzed with the theory of itinerant electron metamagnetism, which considers anisotropic thermal fluctuations of the uranium magnetic moment. The observed pressure dependence of the susceptibility at Tmax and the temperature for the disappearance of the first-order metamagnetic transition are explained with the theory.
Permanent Link: http://hdl.handle.net/11104/0284472