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The presence of non-thermal electrons and large scale magnetic fields in theintra-cluster medium (ICM) is known through the detection of mega-parsec (Mpc)scale diffuse radio synchrotron emission. Although a significant amount ofprogress in finding new diffuse radio sources has happened in the last decade,most of the investigation has been constrained towards massive low-redshiftclusters. In this work, we explore clusters with redshift $z>0.3$ in search ofdiffuse radio emission, at 325 MHz with the Giant Metrewave Radio Telescope(GMRT). This campaign has resulted in the discovery of 2 new radio halos(SPT-CL J0013-4906 and SPT-CL J0304-4401) along with 2 other detections (SPT-CLJ2031-4037 and SPT-CL J2248-4431), previously reported (at 325 MHz) in theliterature. In addition, we detect a halo candidate in 1 cluster in our sample,and upper limits for halos are placed in 8 clusters where no diffuse emissionis detected. In the $P_{1.4} - L_\mathrm{X}$ plane, the detected halos followthe observed correlation, whereas the upper limits lie above the correlationline, indicating the possibility of future detection with sensitiveobservations.

A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT