1. The surname of the fifth author should read Ajit K. Patra.

2. Page 535, Section FUNDING, the number of the funding project should read as follows: Russian Foundation for Basic Research—Department of Science and Technology New Delhi, India (project no. 19-52-45008_IND-а—INT/RUS/RFBR/379).

3. The following paragraph should be added after Section FUNDING:

For the studied sample of Mn2CrAl, we have made a clarification of its crystal structure. The sample was found to have presented by itself a mixture of two different phases: of the β-Mn-type structure with space group P4132 (a = b = c = 6.401 Å; 68.55%) and of the bcc-Cr-type structure with space group Im\(\bar {3}\)m (a = b = c = 2.914 Å; 31.45%). This refinement does not effect the conclusions of our paper, because the metallic character of the β-Mn-type and bcc Cr-type electronic structure results in the Fermi level located in the region of high density of Mn and Cr 3d-states. For this reason, these electrons are weakly involved in the conduction and in the formation of the intraband contribution, which still allows one to relate the anomalies in the optical properties to the features of the electronic structure of the Mn2CrAl alloy.