Magnetic ordering in EuCo$_2$As$_2$
ORAL
Abstract
We have synthesized and studied EuCo$_2$As$_2$ single crystals by resistivity, magnetoresistance, and susceptibility measurements. We found antiferromagnetic (AFM) ordering of the Eu spins at $T_N = 50$ K. Upon applying a magnetic field $H \| ab$ at $T = 2$ K this phase exhibits a metamagnetic (MM) transition at $H_{MM} = 3.5$ T. In case of $H \| c$ the magnetisation increases linearly up to 7 T. The same AFM to MM transition was found at 0.5 T in EuFe$_2$As$_2$ where it was found to be due to the reorientation of the Eu spin. We found that replacing Fe with Co strengthens the coupling between the Eu moments resulting in a higher $T_N$ and H$_{MM}$.
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Authors
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Balazs Sipos
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A.S. Sefat
ORNL, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, Oak Ridge National Laboratory, MST Division, Oak Ridge National Laboratory, ORNL, Oak Ridge, TN, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA, Materials Science \& Technology Division, ORNL, Oak Ridge, TN 37831, USA
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B.C. Sales
ORNL, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, Oak Ridge National Laboratory, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA, Materials Science \& Technology Division, ORNL, Oak Ridge, TN 37831, USA