DC magnetization, specific heat and magnetic relaxation measurements are reported for a polycrystalline U2AuSi3. The temperature dependence of the magnetization shows a cusp at a characteristic temperature Tf that strongly depends on the applied magnetic field. The specific heat does not show visible singularity around Tf, ruling out the existence of the usual long range spatial magnetic order. The pronounced difference between the zero field cooled (ZFC) and the field cooled (FC) magnetization, as well as the very slow decay of the remanence indicate the occurrence of a highly irreversible frozen state below Tf. These features are the characteristics of spin glass behavior.
- A. spin glasses
- D. exchange and superexchange
- D. heat capacity
- D. heavy fermions