Observation of magnetocaloric effect in the LaMn1.9Fe0.1Si2 compound at low fields in the vicinity of phase transition around room temperature


Nane O., Agil H., Ozkurt B., ÖZÇELİK B. , Gencer A.

International Conference on Superconductivity and Magnetism (ICSM), Side, Türkiye, 25 - 29 Ağustos 2008, cilt.153 identifier identifier

Özet

Low field magnetic and magnetocaloric properties of the compound LaMn1.9Fe0.1Si2 have been investigated. Using the M-H data measured at various temperatures, we have derived the magnetic entropy change vertical bar Delta S vertical bar as a function of temperature and magnetic field, by using the Maxwell relation. The temperature dependence of the Landau coefficient has been derived by fitting the magnetization, using the Landau expansion of magnetic free energy and Arrott plots. The results show that LaMn1.9Fe0.1Si2 is ferromagnetically ordered around room temperature (285 K) and the nature of the phase transition at this temperature is found to be second order.

Low field magnetic and magnetocaloric properties of the compound LaMn(1.9)Fe(0.1)Si(2) have been investigated. Using the M-H data measured at various temperatures, we have derived the magnetic entropy change vertical bar Delta S vertical bar as a function of temperature and magnetic field, by using the Maxwell relation. The temperature dependence of the Landau coefficient has been derived by fitting the magnetization, using the Landau expansion of magnetic free energy and Arrott plots. The results show that LaMn(1.9)Fe(0.1)Si(2) is ferromagnetically ordered around room temperature (285 K) and the nature of the phase transition at this temperature is found to be second order