Microscopic coexistence of superconductivity and antiferromagnetism in underdoped Ba(Fe1-xRux)2As2

Abstract

We use ${}^{75}$As nuclear magnetic resonance (NMR) to investigate the local electronic properties of Ba(Fe${}_{1-x}$Ru${}_x$)${}_2$As${}_2$ ($x=$ 0.23). We find two phase transitions, to antiferromagnetism at $T_N\approx$ 60 K and to superconductivity at $T_C\approx$ 15 K. Below $T_N$, our data show that the system is fully magnetic, with a commensurate antiferromagnetic structure and a moment of 0.4 ${\mu }_B$/Fe. The spin-lattice relaxation rate $1{/}^{75}{T}_1$ is large in the magnetic state, indicating a high density of itinerant electrons induced by Ru doping. On cooling below $T_C$, $1{/}^{75}{T}_1$ on the magnetic sites falls sharply, providing unambiguous evidence for the microscopic coexistence of antiferromagnetism and superconductivity.

arXiv commentAccepted in Phys. Rev. Lett

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