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The advent of sensitive low frequency radio observations has revealed anumber of diffuse radio objects with peculiar properties that are challengingour understanding about the physics of the intracluster medium. Here, we reportthe discovery of a steep spectrum radio halo surrounding the central BrightestCluster Galaxy (BCG) in the galaxy cluster SPT-CL J2031-4037. This cluster ismorphologically disturbed yet has a weak cool core, an example of coolcore/non-cool core transition system, which harbours a radio halo of $\sim 0.7$Mpc in size. The halo emission detected at 1.7 GHz is less extended compared tothat in the 325 MHz observation, and the spectral index of the part of the halovisible at 325 MHz to 1.7 GHz frequencies was found to be $-1.35 \pm 0.07$.Also, $P_{1.4\ \mathrm{GHz}}$ was found to be $0.77 \times 10^{24}$ W Hz$^{-1}$which falls in the region where radio mini-halos, halo upper limits andultra-steep spectrum (USS) halos are found in the $P_{1.4\ \mathrm{GHz}} -L_\mathrm{X}$ plane. Additionally, simulations presented in the paper providesupport to the scenario of the steep spectrum. The diffuse radio emission foundin this cluster may be a steep spectrum "intermediate" or "hybrid" radio halowhich is transitioning into a mini-halo.

Diffuse radio emission in the galaxy cluster SPT-CL J2031-4037: a steep spectrum intermediate radio halo?