Pressure effects on the heavy-fermion antiferromagnet CeAuSb2

2012/03/23 by S. Seo, V. A. Sidorov, Seo, S. +11
Physics and Astronomy · Materials Science · #Rare-earth and actinide compounds #Iron-based superconductors research #Superconductivity in MgB2 and Alloys

paper · pdf · doi:10.48550/arxiv.1203.5164

Abstract

The f-electron compound CeAuSb2, which crystallizes in the ZrCuSi2-type tetragonal structure, orders antiferromagnetically between 5 and 6.8 K, where the antiferromagnetic transition temperature T_N depends on the occupancy of the Au site. Here we report the electrical resistivity and heat capacity of a high-quality crystal CeAuSb2 with T_N of 6.8 K, the highest for this compound. The magnetic transition temperature is initially suppressed with pressure, but is intercepted by a new magnetic state above 2.1 GPa. The new phase shows a dome shape with pressure and coexists with another phase at pressures higher than 4.7 GPa. The electrical resistivity shows a T² Fermi liquids behavior in the complex magnetic state, and the residual resistivity and the T² resistivity coefficient increases with pressure, suggesting the possibility of a magnetic quantum critical point at a higher pressure.

Related

• From an antiferromagnet to a heavy-fermion system: CeCu5Au under pressure
• The unusual phase diagram of CeNiGe2
• Magnetic field-tuned magnetic order and metamagnetic criticality in non-stoichiometric CeAuBi₂
• Transport Properties of Heavy Fermion Compounds
• Investigation of the atomic coordinates of CeNiC₂ under pressure: switching of the Ce-Ce first nearest neighbor direction