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From our powder x ray diffraction pattern, electrical transport and magneticstudies we report the effect of isovalent Se substitution at S sites in thenewly discovered systems EuSr2Bi2S4F4 and Eu2SrBi2S4F4. We have synthesized twonew variants of 3244 type superconductor with Eu replaced by Sr which isreported elsewhere [Z. Haque et. al.]. We observe superconductivity at Tc 2.9 K(resistivity) and 2.3 K (susceptibility) in EuSr2Bi2S4-xSexF4 series for x = 2.In the other series Eu2SrBi2S4-xSexF4, two materials (x= 1.5; Tc = 2.6 K and x= 2; Tc = 2.75 K) exhibit superconductivity.

Superconductivity in Se-doped new materials EuSr2Bi2S4F4 and Eu2SrBi2S4F4