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Bilayered Sr3Ru2O7 is an unusual metamagnetic metal with inherentlyantiferromagnetic (AFM) and ferromagnetic (FM) fluctuations. Partialsubstitution of Ru by Mn results in the establishment of metal-insulatortransition (MIT) at TMIT and AFM ordering at TM in Sr3(Ru1-xMnx)2O7. Usingelastic neutron scattering we determined the effect of Mn doping on themagnetic structure and in-plane magnetic correlation lengths inSr3(Ru1-xMnx)2O7 (x = 0.06 and 0.12). With increasing Mn doping (x) from 0.06to 0.12 or decreasing temperatures for x=0.12, an evolution from an in-planeshort-range to long-range double-stripe AFM ground state occurs. For bothcompounds, the onset of magnetic correlation with an anisotropic behaviorcoincides with the sharp rise of the electrical resistivity and the specificheat. Since it does not induce measurable lattice distortion, the double-stripemagnetic order with anisotropic spin texture breaks the symmetry from C4vcrystal lattice to C2v magnetic sublattice. These observations shed new lighton an age-old question of Slater versus Mott-type MIT.

Mn-induced magnetic symmetry breaking and its correlation with the metal-insulator transition in bilayered Sr3(Ru1-xMnx)2O7