Investigation of critical behavior in La1-xCexMn2Si2 (x=0.35 and 0.45) by using the dependence of magnetic entropy change

Yıl 2018, Cilt: 20 Sayı: 1, 186 - 197, 17.07.2018

Barış Emre

https://doi.org/10.25092/baunfbed.344783

Öz

The critical exponents
of La_1-xCe_xMn₂Si₂ (x=0.35 and 0.45)
compounds are studied in the vicinity of Curie temperature (T_C)
which is a second order phase transition. The magnetic field dependence of the
magnetic entropy change is brought out and implemented to deduce the critical
exponents. The critical exponents are estimated by various techniques such as
the Modified Arrott plot and critical isotherm technique. The obtained values
of critical exponents for both compounds have been satisfied with the scaling
theory. The results have showed that the critical values and universal curve
depends on the strength of secondary magnetic phase existing in the compound,
which is antiferromagnetic phase in our case. 

Anahtar Kelimeler

Intermetallics, magnetic properties, magnetocaloric effect, critical phenomena

La1-xCexMn2Si2 (x=0.35 ve 0.45) kritik davranışının manyetik entropi değişim bağlılığına göre araştırılması

Öz

La_1-xCe_xMn₂Si₂
(x=0.35 ve 0.45) bileşiklerinin,
kritik üstelleri ikinci derece bir faz geçişi olan, Curie sıcaklığı (T_C)
civarında incelenmiştir. Manyetik entropi değişiminin, manyetik alana
bağımlılığı ortaya konulmuş ve kritik üstelleri bulmak için uygulanmıştır.
Kritik üsteller, Modifiye Arrott çizimi ve kritik izoterm tekniği gibi çeşitli
yöntemlerle tahmin edilmiştir. Elde edilen kritik üsteller, ölçekleme teorisi
uygun oldukları belirlenmiştir. Sonuçlar, kritik değerin ve evrensel eğrinin;
bu çalışmada antiferromanyetik faz olan, bileşikte oluşan ikinci manyetik fazın
şiddetine bağlı olduğunu göstermiştir.

Anahtar Kelimeler

Intermetalik, manyetik özellikler, manyetokalorik etki, kritik olay

Kaynakça

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