Abstract
Static magnetization for single crystals of Nd0.7Pb0.3MnO3 has been studied around the ferromagnetic-to-paramagnetic transition temperature T C . The results of measurements carried out in the critical range |(T−T C )/T C |≤0.1 are reported. The critical exponents β and γ for the thermal behavior of magnetization and susceptibility have been obtained both from the modified Arrott plots and the Kouvel–Fisher method. The exponent δ, independently obtained from the critical isotherm, was found to satisfy the Widom scaling relation δ=γ/β+1. The values of exponents are consistent with those expected for isotropic magnets belonging to the Heisenberg universality class with short-range exchange in three dimensions. The maximum magnetic entropy change is found at around T C . We found a universal scaling behavior in the relative change of magnetic entropy (ΔS M ). The rescaled curves of the magnetic entropy change for different applied fields are observed to collapse onto a single curve, which validates the second order nature of the phase transition in Nd0.7Pb0.3MnO3.
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Acknowledgements
N.G. thanks the SFB 463 Project funded by DFG for financial support during his work in IFW Dresden and Dr. K. Nenkov for measurements.
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Ghosh, N. Heisenberg-Like Critical Properties and Magnetocaloric Effect in Lead Doped NdMnO3 Single Crystal. J Supercond Nov Magn 26, 1451–1454 (2013). https://doi.org/10.1007/s10948-012-2038-7
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DOI: https://doi.org/10.1007/s10948-012-2038-7