2005/09/05 by Kausik Sengupta, P. L. Paulose, E. V. Sampathkumaran +3 · 23 citations
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ferromagnetism #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic susceptibility #Magnetization #Materials science #Physics #Quantum mechanics #Rare-earth and actinide compounds #Tetragonal crystal system #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.184424
published in Physical Review B 72(18) (American Physical Society) · Phys. Rev. B, in press
arxiv created 2005/09/05 · openalex publication_date 2005/11/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The Eu-based compound, EuCu2As2, crystallizing in the ThCr2Si2-type tetragonal structure, has been synthesized and its magnetic behavior has been investigated by magnetization (M), heat-capacity (C), and electrical resistivity (\ensuremathρ) measurements as a function of temperature (T) and magnetic field (H) as well as by 151Eu M"ossbauer measurements. The results reveal that Eu is divalent, ordering antiferromagnetically below 15\phantom\rule0.3em0exK in the absence of a magnetic field, apparently with the formation of magnetic Brillouin-zone boundary gaps. A fascinating observation is made in a narrow temperature range before antiferromagnetism sets in: That is, there is a remarkable upturn just below 20\phantom\rule0.3em0exK in the plot of magnetic susceptibility versus T, even at low fields, as though the compound actually tends to order ferromagnetically. There are corresponding anomalies in the magnetocaloric effect data as well. In addition, a small application of magnetic field (around 1\phantom\rule0.3em0exkOe at 1.8\phantom\rule0.3em0exK) in the antiferromagnetic state causes the spin-reorientation effect. These results suggest that there is a close balance between antiferromagnetism and ferromagnetism in this compound.