Physical properties of EuPtIn4intermetallic antiferromagnet
- Author(s): Rosa, PFS
- De Jesus, CBR
- Fisk, Z
- Pagliuso, PG
- et al.
Published Web Locationhttps://doi.org/10.1016/j.jmmm.2014.07.001
We report the physical properties of EuPtIn4single crystalline platelets grown by the In-flux technique. This compound crystallizes in the orthorhombic Cmcm structure with lattice parameters a=4.542(1)A., b=16.955(2)A. and c=7.389(1)A. Measurements of magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) reveal that EuPtIn4is a metallic Curie-Weiss paramagnet at high temperatures with an effective moment ofμeff≈7.8(1)μBdue to divalent Eu ions. At low temperatures, antiferromagnetic (AFM) ordering is observed atTN=13.3K followed by a successive anomaly atT=12.6K. In addition, within the magnetic state, a spin-flop transition is observed withHc~2.5T at T=1.8 K when the magnetic field is applied along the ac-plane. In the paramagnetic state, a single divalent Eu2+Dysonian ESR line with a Korringa relaxation rate of b=4.1(2)Oe/K is observed. Interestingly, even at high temperatures, both ESR linewidth and electrical resistivity reveal a similar anisotropy. We discuss a possible common microscopic origin for the observed anisotropy in these physical quantities likely associated with an anisotropic magnetic interaction between Eu2+4f electrons mediated by conduction electrons. © 2014 Elsevier B.V.