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4.4 Summary

From the $\mu$SR measurements of the spin-ladder material Srn-1Cun+1O2n, we observed static magnetic order for the 3-leg ladder system at T$\sim$52 K, while, in the 2-leg ladder system, no magnetic order was present down to 20 mK. Our results support the theoretical expectations of the magnetic ground states of the ladder systems, namely, a non-magnetic ground state for the 2-leg ladder system, and a magnetic ordered state for the 3-leg ladder system.