Baris Emre et al 2009 Phys. Scr. 80 055703 doi:10.1088/0031-8949/80/05/055703
Baris Emre1, Ilker Dincer1, Yalcin Elerman1 and Eyup Duman2
Show affiliationsThe magnetic and magnetocaloric properties of La0.8Sm0.2Mn2Si2 and La0.775Gd0.225Mn2Si2 compounds have been studied by temperature- and magnetic field-dependent magnetic measurements. Both compounds crystallize in the ThCr2Si2-type structure with the space group I4/mmm. Both compounds exhibit reentrant magnetic phase transitions and field-induced transitions from antiferromagnetic to ferromagnetic or ferrimagnetic state. The isothermal magnetic entropy change is estimated by using the Maxwell relation and Landau theory. Both compounds show inverse and conventional magnetocaloric effects around transition temperatures. Application of Landau theory on magnetic transitions shows good agreement with the result obtained by Maxwell theory.
75.30.Sg Magnetocaloric effect, magnetic cooling
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
65.40.G- Other thermodynamical quantities
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Issue 5 (November 2009)
Received 14 April 2009, accepted for publication 16 September 2009
Published 27 October 2009
Baris Emre et al 2009 Phys. Scr. 80 055703
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