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Neutron scattering measurements have demonstrated that the heavily Cu-dopedNaFe$_{1-x}$Cu$_{x}$As compound behaves like a Mott insulator exhibiting bothreal space Fe-Cu stripes, as well as antiferromagnetism below a N\'eeltemperature for $x\lesssim 0.5$. We have investigated evolution of structuraland magnetic ordering using $^{23}$Na and $^{75}$As NMR for single crystals($x$ = 0.39 and 0.48), confirming antiferromagnetism in the form of magneticstripes. We show that end-chain defects in these stripes are the principalsource of magnetic disorder and are responsible for cluster spin-glasstransitions in both compounds, in the latter case coexistent withantiferromagnetism. Aided by our numerical simulation of the $^{75}$As spectra,we show that a staggered magnetization at the Fe sites is induced bynon-magnetic Cu dopants.

Stripe Antiferromagnetism and Disorder in the Mott Insulator NaFe$_{1-x}$Cu$_{x}$As ($x \lesssim 0.5$)