Physics – Condensed Matter – Materials Science
Scientific paper
2004-07-19
Physics
Condensed Matter
Materials Science
25 pages manuscript, 8 figures
Scientific paper
The effect of disorder on the critical properties of the ferromagnetic phase transition in colossal magnetoresistive manganite La0.67Ca0.33MnO3 has been studied by substituting Ga for Mn. It is found that, upon 10% Ga substitution, the peak in the specific heat at the Curie point T_C changes drastically and appears as a small anomaly. Static magnetization data analyzed in the asymptotic critical region using modified Arrott plots and the Kouvel-Fisher method give values for the critical exponents beta=0.387(6), gamma=1.362(2), and delta=4.60(3). The results show that the first-order transition in La0.67Ca0.33MnO3 becomes continuous by Ga substitution. The critical properties of the rounded transition in La0.67Ca0.33Mn0.9Ga0.1O3 suggest that the magnetic subsystem in this mixed-valent perovskite is close to that of a conventional isotropic ferromagnet belonging to the Heisenberg universality class with short-range interactions. It is concluded that the first-order magnetic transition in pure La0.67Ca0.33MnO3 is induced by fluctuations from a competing mode, which couples to the magnetic subsystem.
Dörr Kathrin
Eckert Dominique
Müller Konrad H.
Nenkov Konstantin
Roessler Sahana
No associations
LandOfFree
Rounding of a first-order magnetic phase transition in Ga doped La0.67Ca0.33MnO3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Rounding of a first-order magnetic phase transition in Ga doped La0.67Ca0.33MnO3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rounding of a first-order magnetic phase transition in Ga doped La0.67Ca0.33MnO3 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-535583