Anomalous magnetocaloric effect in YbAs associated with the giant quadrupolar interaction - art. no. 024422

We report a theoretical investigation that predicts the existence of anomal ous magnetocaloric effect in the YbAs compound. The YbAs coot upon magnetiz ing and warm upon demagnetizing, in the temperature range between 33 and 84 It for external magnetic field change from 0 to 23.5 T. The anomalous effe ct can be observed on the negative part of magnetic entropy changes, upon v ariation of the external magnetic field, in an isothermic process. This stu dy was carried out using a model Hamiltonian, which takes into account the crystalline electrical field and the quadrupolar interactions within the mo lecular-field approximation.