Magnetism of UCo₂Si₂ single crystal studied under applied magnetic field and hydrostatic pressure

Abstract

UCo₂Si₂ orders antiferromagnetically at T _N=82.5 K. The magnetic ordering is accompanied by pronounced anomalies of the specific heat, magnetization and resistivity. Resistivity is notably anisotropic depending on the current direction. We have observed the evolution of the T _N-related resistivity features with increasing hydrostatic pressure up to 7.3 GPa. T _N value decreases with increasing pressure; the critical pressure for the collapse of the ordered magnetism is about 8 GPa.

Keywords:

• Uranium compounds
• Specific heat
• Pressure
• Resistivity

Acknowledgements

This work is a part of the research plans MSM 0021620834 financed by the Ministry of Education of the Czech Republic (M.M, V.S.) and AVOZ10100520 financed by the Academy of Sciences of Czech Republic (A.V.A.). V.S. and M.M. were also supported by the Cost P16 program and the grant OC145 of the Ministry of Education of the Czech Republic. A.K. acknowledges the European Commission for support in the frame of the ‘Training and Mobility of Researchers’ programme.