Giant Magnetocaloric Effect in Re-entrant Ferromagnet PrMn1.4Fe0.6Ge2 - Condensed Matter > Materials ScienceReportar como inadecuado




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Abstract: Three first order magnetic phase transitions FOMT have been detected atTCPr, TNinter and TCinter over the temperature range from 5 K to 340 K atfields up to 9 T in PrMn1.4Fe0.6Ge2, and the magnetocaloric effect MCE aroundthese transitions evaluated.
The MCE of two FOMT from planar antiferromagnetismAFl to c-axis ferromagnetism Fmc around 168 K, and from the Fmc state tothe c-axis AFmc state around 157 K have acceptable values compared with thoseof existing MCE systems.
A giant magnetocaloric effect GMCE has been observedaround 25.5 K associated with the field-induced FOMT from the AFmc to theFmc+FPr state with an additional Pr magnetic contribution.
The MCE value 29.1J-kg K with field change 7 T is comparable to and even larger than reportedvalues for the best-performed MCE materials.
In particular, the giant MCE valueof 12.3 J-kg K obtained for the relatively small field change from 0 to 1 T isvery beneficial for applications, and this, together with the small magneticand thermal hysteresis, suggests that PrMn1.4Fe0.6Ge2 may be a promisingcandidate for magnetic refrigeration applications in the hydrogen liqueficationtemperature range.



Autor: R.
Zeng, J.
L Wang, L.
Lu, W.X.
Li, S.J.
Campbell, S.
X.
Dou


Fuente: https://arxiv.org/



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