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Inverse and conventional magnetic entropy change in La0.8Sm0.2Mn2Si2 and La0.775Gd0.225Mn2Si2 compounds

Baris Emre1, Ilker Dincer1, Yalcin Elerman1 and Eyup Duman2

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The 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.


PACS

75.30.Sg Magnetocaloric effect, magnetic cooling

61.66.Fn Inorganic compounds

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.)

75.47.De Giant magnetoresistance

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 5 (November 2009)

Received 14 April 2009, accepted for publication 16 September 2009

Published 27 October 2009



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