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  • Title: Large variations in the magnetic ordering behavior of EuCu(2)As(2) with the application of external pressure and magnetic field.
    Author: Sengupta K, Alzamora M, Fontes MB, Sampathkumaran EV, Ramos SM, Hering EN, Saitovitch EM, Paulose PL, Ranganathan R, Doert T, Jemetio JP.
    Journal: J Phys Condens Matter; 2012 Mar 07; 24(9):096004. PubMed ID: 22322996.
    Abstract:
    The influence of external pressure on the electrical transport and magnetic properties of EuCu(2)As(2), crystallizing in a ThCr(2)Si(2)-type structure, is reported. The system is known to be an antiferromagnet below T(N) ≈ 15 K in the absence of external magnetic fields. We find that there is a gradual reduction of T(N) with the application of a magnetic field with an extrapolated value of the critical field of around 18 kOe which can drive T(N) to zero. Electrical resistivity under pressure (<11 GPa) reveals that the magnetic ordering temperature is pushed up dramatically to higher temperatures which is quite interesting if compared with the behavior in isostructural FeAs-based systems containing Eu. Above 7 GPa, the pressure-induced state appears to be ferromagnetic. The results thus reveal interesting changes in the magnetic ordering behavior of this compound with increasing pressure and magnetic fields.
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