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We report a theoretical investigation that predicts the existence of anomalous magnetocaloric effect in the YbAs compound. The YbAs cool upon magnetizing and warm upon demagnetizing, in the temperature range between 33 and 84 K for external magnetic field change from 0 to 23.5 T. The anomalous effect can be observed on the negative part of magnetic entropy changes, upon variation of the external magnetic field, in an isothermic process. This study was carried out using a model Hamiltonian, which takes into account the crystalline electrical field and the quadrupolar interactions within the molecular-field approximation.
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Ranke et al. (2000) studied this question.
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