Anisotropic magnetic properties of EuAl2Si2

International Conference on Strongly Correlated Electron Systems 2014

Maurya, Arvind^1 ; Kulkarni, Ruta^1 ; Thamizhavel, A.^1 ; Bonville, P.^2 ; Dhar, S.K.^1

Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai

400 005, India^1

CEA Saclay, DSM/IRAMIS, Service de Physique de l'Etat Condensé, Gif- Sur-Yvette

91191, France^2

关键词: Anisotropic behaviours;    Antiferromagnetic correlations;    Antiferromagnetic transition;    Applied magnetic fields;    Isothermal magnetization;    Polycrystalline samples;    Spin-flop transitions;    Ssbauer spectroscopies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012045/pdf
DOI  :  10.1088/1742-6596/592/1/012045

来源: IOP

【 摘 要 】

EuAl2Si2is known to crystallize in the CaAl2Si2-type trigonal structure. We have grown single crystals of EuAl2Si2by flux method, using Al-Si eutectic (87.8% Al) as self-flux, and investigated their anisotropic magnetic properties by means of magnetization, electrical resistivity and heat capacity in zero and applied magnetic fields, and151Eu Mössbauer spectroscopy. Magnetic susceptibility data show an antiferromagnetic transition at TN33.3 K in agreement with the previously reported value on polycrystalline sample. The isothermal magnetization at 2 K measured along and perpendicular to the c-axis shows anisotropic behaviour, which is rather unexpected as Eu2+is an S-state ion. The spin flip fields along the two directions are 2.8 and 4.8 T, respectively, while two closely spaced spin-flop transitions in the ab-plane are observed near 1.4 and 1.6 T. The electrical resistivity shows an upturn between TNand 60 K as the temperature is lowered below ∼ 60 K, suggesting the presence of antiferromagnetic correlations in the paramagnetic state. Magnetoresistivity at 2 K in 14 T is nearly 1070 % for H // [0001]. The results of heat capacity and151Eu Mössbauer spectroscopy are in conformity with a bulk transition at 33.3 K.