Low temperature specific heat measurements on Co3B7O13I, Co3B7O13Br and Co3B7O13Cl

Abstract
Low temperature specific heat measurements have been performed on iodine (Co3B7O13I), bromine (Co3B7O13 Br) and chlorine (Co3B7O13Cl) cobalt boracites. The measurements carried out between 3 K and 60 K, have revealed the existence of a Schottky type anomaly at about 22 K, 8 K and 10 K for iodine, bromine and chlorine boracites, respectively.