Abstract
The magnetic and magnetocaloric properties of polycrystalline samples ofGd1−xSmxMn2Ge2 have been studied. All the compounds exceptGdMn2Ge2 show re-entrant ferromagnetic behavior. Multiple magnetic transitions observed in thesecompounds are explained on the basis of the temperature dependences of the exchange strengthsof the rare earth and Mn sublattices. The magnetocaloric effect is found to be positive at there-entrant ferromagnetic transition, whereas it is negative at the antiferro–ferromagnetictransition. The Sm compounds are found to show a negative magnetocaloric effectat temperatures below the re-entrant ferromagnetic transition temperature. InSmMn2Ge2, the magnetic entropy change associated with the re-entrant transition is found to decreasewith field, which may be attributed to the crystal-field effect as well as the increase in theintralayer antiferromagnetic component of the Mn sublattice. The maximum value of theisothermal magnetic entropy change in this series of compounds is found to decrease withincrease in Sm concentration.
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