Quantum phase transition in itinerant-electron ferromagnet system U(Co.sub.1-x./sub.Os.sub.x./sub.)Al

0494858 - FZÚ 2019 RIV JP eng J - Journal Article
Maeda, M. - Andreev, Alexander V. - Shirasaki, K. - Yamamura, T. - Kimura, N.
Quantum phase transition in itinerant-electron ferromagnet system U(Co_1-xOs_x)Al.
Journal of the Physical Society of Japan. Roč. 87, č. 9 (2018), s. 1-7, č. článku 094713. ISSN 0031-9015
R&D Projects: GA ČR GA16-03593S
Institutional support: RVO:68378271
Keywords : uranium intermetallics * UCoAl * itinerant electron metamagnetism * ferromagnetism
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.570, year: 2018

We report the magnetic phase diagram of an itinerant-electron ferromagnetic system, U(Co1-xOsx)Al, derived from the AC susceptibility and DC magnetization. The quantum phase transition point at which the ferromagnetic transition temperature becomes 0 K is estimated to be located at x = 0.004. The tricritical point is also estimated to be located at x = 0.0065, T = 11 K. We also observed a non-Fermi liquid behavior near the quantum phase transition point: the electrical resistivity in the paramagnetic region is proportional to T3/2 rather than to T5/3 that is predicted at the quantum critical point. The T3/2 dependence is observed in some other itinerant-electron magnets. We discuss the possible mechanisms applied to these compounds.

Permanent Link: http://hdl.handle.net/11104/0287919