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Tricritical behavior and Griffith phase in La1-xCaxMnO3 under high applied fields
Ist Teil von
Journal of magnetism and magnetic materials, 2017-11, Vol.441, p.290-295
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•High applied fields influence the magnetic properties of La0.7Ca0.3MnO3.•Transformation from the first order to the crossover of first- and second-order transitions.•The suppression of Griffiths phase.
Studying the magnetic property of La0.7Ca0.3MnO3 (LCMO) bulks, it has been found that they exhibit a first-order phase transition (FOPT) around the ferromagnetic-paramagnetic (FM-PM) transition. However, most previous studies just concerned on their magnetic property for applied fields below 60kOe. To learn more about this material system, we have considered the influence of high applied fields up to 140kOe on the magnetic property of a polycrystalline LCMO bulk sample. The detailed analyses based on the Banerjee criterion, Arrott and Kouvel-Fisher methods, and scaling hypothesis prove LCMO exhibiting the first-order phase transition at low applied fields (H) and the tricritical behavior at high applied fields H>65kOe with critical exponents β≈0.25 and γ≈1 close to those expected for the tricritical mean-field theory. We have also found a strong dependence of the FM-PM transition temperature (TC) on H varying as a power function TC(H)∝Hn (with n=0.64 and H>3.5kOe), and an existence of the Griffiths phase that is completely suppressed as H≥35kOe.