Metamagnetic transition in Ca$_{1-x}$Sr$_x$Co$_2$As$_2$($x$ = 0 and 0.1) single crystals

We report the magnetism and transport measurements of CaCo $_{2}$ As $_{2}$ and Ca $_{0.9}$ Sr $_{0.1}$ Co $_{2}$ As $_{2}$ single crystals. Antiferromagnetic transition was observed at about 70 K and 90 K for CaCo $_{2}$ As $_{2}$ and Ca $_{0.9}$ Sr $_{0.1}$ Co $_{2}$ As $_{2}$ , respectively. Magnetism and magnetoresistance measurements reveal metamagnetic transition from an antiferromagnetic state to a ferromagnetic state with the critical field of 3.5 T and 1.5 T respectively along c-axis for these two materials at low temperature. For the field along ab-plane, spins can also be fully polarized above the field of 4.5 T for Ca $_{0.9}$ Sr $_{0.1}$ Co $_{2}$ As $_{2}$ . While for CaCo $_{2}$ As $_{2}$ , spins can not be fully polarized up to 7 T. We proposed the cobalt moments of these two materials should be ordered ferromagnetically within the ab-plane but antiferromagnetically along the c-axis(A-type AFM).

Metamagnetic transition in Ca $_{1 - x}$ Sr $_{x}$ Co $_{2}$ As $_{2}$ ( $x$ = 0 and 0.1) single crystals

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Metamagnetic transition in Ca $_{1 - x}$ Sr $_{x}$ Co $_{2}$ As $_{2}$ ( $x$ = 0 and 0.1) single crystals

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Metamagnetic transition in Ca1−x1−x​Srxx​Co22​As22​(xx = 0 and 0.1) single crystals

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Metamagnetic transition in Ca1−x1−x​Srxx​Co22​As22​(xx = 0 and 0.1) single crystals

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Metamagnetic transition in Ca $_{1 - x}$ Sr $_{x}$ Co $_{2}$ As $_{2}$ ( $x$ = 0 and 0.1) single crystals

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Metamagnetic transition in Ca $_{1 - x}$ Sr $_{x}$ Co $_{2}$ As $_{2}$ ( $x$ = 0 and 0.1) single crystals

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