Pressure-Induced Antiferromagnetic Bulk Superconductor EuFe$_2$As$_2$

Details Pressure-Induced Antiferromagnetic Bulk Superconductor EuFe$_2$As$_2$ Pressure-Induced Antiferromagnetic Bulk Superconductor EuFe$_2$As$_2$

2009-08-17

arxiv.org/abs/0908.2280v1

Physics

Condensed Matter

Superconductivity

submitted to the proceedings of the M2S-IX Tokyo

Scientific paper

We present the magnetic and superconducting phase diagram of EuFe$_2$As$_2$ for $B \parallel c$ and $B \parallel ab$. The antiferromagnetic phase of the Eu$^{2+}$ moments is completely enclosed in the superconducting phase. The upper critical field vs. temperature curves exhibit strong concave curvatures, which can be explained by the Jaccarino-Peter compensation effect due to the antiferromagnetic exchange interaction between the Eu$^{2+}$ moments and conduction electrons.

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