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- Title
Influence of Ti Doping on the Critical Behavior and Magnetocaloric Effect in Disordered Ferromagnets LaBaMnTiO.
- Authors
Ho, T.; Phan, M.; Phuc, N.; Lam, V.; Phan, T.; Yu, S.
- Abstract
The Ti-substitution influence on the magnetic and magnetocaloric properties of LaBaMnTiO ( x = 0.05 and 0.1) was investigated. Based on Banerjee's criteria and Franco's universal curves, we proved the existence of a second-order magnetic phase transition in the samples. Using the modified Arrott plot method, we determined the critical parameters T ≈ 245 K, β = 0.374 ± 0.013, γ = 1.228 ± 0.045, and δ = 4.26 ± 0.03 for x = 0.05, and T ≈ 169 K, β = 0.339 ± 0.001, γ = 1.307 ± 0.003, and δ = 4.78 ± 0.02 for x = 0.1. With these critical values, the predictable scaling behavior of the M( H) data above and below T proves that the calculated exponents are unambiguous and intrinsic. The values β = 0.374 for x = 0.05 and β = 0.339 for x = 0.1 suggest that the magnetic phase transition of the samples falls into the three-dimensional (3D) Heisenberg and 3D Ising universality classes, respectively, corresponding to short-range ferromagnetic (FM) order due to FM clusters in a wide temperature range even above T, as confirmed by electron spin resonance studies. In reference to the magnetocaloric effect around T, the magnetic entropy change reaches maximum values (|ΔS|) of about 4 and 3 J kg K for x = 0.05 and 0.1, respectively, for a magnetic field change 50 kOe. Magnetic field dependencies of |ΔS| obey a power function |ΔS( H)| ∝ H, where exponent values n = 0.59 and 0.61 for x = 0.05 and 0.1, respectively, were determined from the relation n = 1 + ( β-1)/( β + γ). The difference between the experimental n values and the theoretical value n = 2/3 of the mean field model is due to the presence of short-range FM order in the samples.
- Subjects
MANGANITE; DOPING agents (Chemistry); MAGNETOCALORIC effects; FERROMAGNETIC materials; MAGNETIC transitions
- Publication
Journal of Electronic Materials, 2016, Vol 45, Issue 5, p2508
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-016-4397-5