We present the DC magnetization, specific heat and magnetic relaxation measurements on well-annealed polycrystalline sample of U2PtSi3. All the main characteristics of spin-glass behavior are observed. They are: (1) frozen-in magnetic moments below a freezing temperature Tf and, hence, a peak in the field-dependent magnetization; (2) absence of visible singularity in temperature dependence of specific heat at Tf; (3) irreversibility in magnetization below Tf; (4) remanent magnetic relaxation on macroscopic time scales after changing the magnetic field below Tf. The spin-glass state in U2PtSi3 at low temperatures is considered to originate from the randomly frustrated U-U interactions resulting from the disordering of Pt and Si atoms on the crystallographic sites.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics