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The crystal structure, magnetic, electronic, and thermal properties ofMn-doped SrFe2As2 crystals have been systematically investigated. A miscibilitygap is found in the system from x = 0.4362(4) to x = 0.9612(9). For x <0.2055(2), the single crystals holding tetragonal structure (space group I4/mmm(no. 139)) have a continuously enlarged lattice parameter c, followed by aphase separation with crystals holding both tetragonal and trigonal structuresup to x = 0.4362(4). Beyond the miscibility gap, the crystals with x >0.9612(9) hold the trigonal structure (space group P-3m1 (no. 164)). Moreover,the spin density wave ordering for x = 0 to x = 0.0973(1) is suppressed,followed by an abnormal and broadened increase of the ordering temperature forx = 0.0973(1) to x = 0.2055(2). Eliminating the possibility of real-space phaseseparation of Mn and Fe based on the results of X-ray diffraction, this novelphenomenon can be attributed to a possible intrinsic Griffiths phase. No anysuperconducting signals are observed down to 2 K in the whole composition rangewith 0 < x < 1. A phase diagram with multi-critical points of Mn-doped SrFe2As2system is established accordingly.

Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1-xMnx)2As2 crystals grown by transitional metal arsenide flux