First and second order magnetic and structural transitions in BaFe${}_{2(1-x)}$Co${}_{2x}$As${}_2$

Abstract

We present here high resolution magnetization measurements on high-quality BaFe${}_{2(1-x)}$Co${}_{2x}$As${}_2$, 0$\le$x$\le$0.046 as-grown single crystals. The results confirm the existence of a magnetic tricritical point in the ($x$,$T$) plane at x${}_{tr}^m$$\approx$0.022 and reveal the emergence of the heat capacity anomaly associated with the onset of the structural transition at x${}^s$$\approx$0.0064. We show that the samples with doping near x${}_{tr}^m$ do not show superconductivity, but rather superconductivity emerges at a slightly higher cobalt doping, x$\approx$0.0315

4 pages, 5 figures

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