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Investigation of Arrott plot and magnetocaloric effect in the complex CaMn7O12 perovskite

Detailed magnetic studies including magneto-caloric measurements on magnetic multiferroic quadruple perovskite CaMn7O12 are presented. Based on the collective response of Arrott plots and ΔSM (T), a magnetic phase diagram of CaMn7O12 is suggested. A new magnetic transition at TN3 ~20 K where the system changes from noncollinear AFM to collinear AFM is reported. An anomaly observed in both ΔSM (T) and Arrott plots around 64 K has been attributed to high external field induced spin canting leading to change in magnetic order inducing phase transition. Magneto-caloric effect in this material is presented for the first time. The peak value of change in isothermal magnetic entropy is 1.3 J/K-Kg and the value of refrigeration capacity is reported to be 34.5 J/Kg for the field of 7 T.

preprint2015arXivOpen access
Parul JainBabita IngaleGyaneshwar SharmaL. C. GuptaA. K. GanguliRatnamala Chatterjee
cond-mat.mtrl-sci
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Parul JainBabita IngaleGyaneshwar SharmaL. C. GuptaA. K. GanguliRatnamala Chatterjee

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