Coexistence of cluster spin glass and superconductivity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ for $0.060\le x\le 0.071$

Abstract

We present 75As nuclear magnetic resonance data from measurements of a series of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ crystals with $0.00\le x\le 0.075$ that reveals the coexistence of frozen antiferromagnetic domains and superconductivity for $0.060\le x\le 0.071$. Although bulk probes reveal no long range antiferromagnetic order beyond $x=0.06$, we find that the local spin dynamics reveal no qualitative change across this transition. The characteristic domain sizes vary by more than an order of magnitude, reaching a maximum variation at $x=0.06$. This inhomogeneous glassy dynamics may be an intrinsic response to the competition between superconductivity and antiferromagnetism in this system.

8 pages, 5 figures, accepted to Phys. Rev. Lett. Oct. 14, 2013

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