Two successive field-induced spin-flop transitions in single-crystalline CaCo$_{2}$As$_{2}$

Details Two successive field-induced spin-flop transitions in single-crystalline CaCo$_{2}$As$_{2}$ Two successive field-induced spin-flop transitions in single-crystalline CaCo$_{2}$As$_{2}$

2012-04-08

arxiv.org/abs/1204.1736v1

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. B. 5 pages, 6 figures

Scientific paper

CaCo$_{2}$As$_{2}$, a ThCr$_{2}$Si$_{2}$-structure compound, undergoes an antiferromagnetic transition at \emph{T$_{N}$}=76K with the magnetic moments being aligned parallel to the \emph{c} axis. Electronic transport measurement reveals that the coupling between conducting carriers and magnetic order in CaCo$_{2}$As$_{2}$ is much weaker comparing to the parent compounds of iron pnictide. Applying magnetic field along \emph{c} axis induces two successive spin-flop transitions in its magnetic state. The magnetization saturation behaviors with \emph{\textbf{H}$\parallel$c} and \emph{\textbf{H}$\parallel$ab} at 10K indicate that the antiferromagnetic coupling along \emph{c} direction is very weak. The interlayer antiferromagntic coupling constant \emph{J$_{c}$} is estimated to be about 2 meV.

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