Abstract
The second magnetization harmonic was studied for a moderately doped Nd0.77Ba0.23MnO3 neodymium manganite single crystal in parallel constant and harmonic magnetic fields in the critical paramagnetic region. According to the neutron and X-ray diffraction data, the crystal was crystallographically single-phase and had a pseudocubic structure both at room temperature and below the Curie point T C=124.1 K. Although the specific resistance of this compound had a singularity near T C and exhibited giant magnetoresistance, it remained an insulator in the ferromagnetic state. Nonlinear response measurements in the T C<T<T *≈146.7 K paramagnetic region were indicative of the existence of two magnetic phases. Above T *, the crystal was magnetically single-phase, and its critical behavior was well described by dynamical similarity theory for isotropic 3D ferromagnets. The unexpected appearance of a new magnetic phase in the structurally homogeneous crystal was discussed based on phase separation ideas; such a phase separation could occur in moderately doped cubic manganites experiencing orbital ordering.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 121, No. 3, 2002, pp. 678–691.
Original Russian Text Copyright © 2002 by Ryzhov, Lazuta, Luzyanin, Larionov, Khavronin, Chernenkov, Troyanchuk, Khalyavin.
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Ryzhov, V.A., Lazuta, A.V., Luzyanin, I.D. et al. The nonlinear magnetic properties of the pseudocubic Nd0.77Ba0.23MnO3 single crystal in the critical paramagnetic region and phase separation. J. Exp. Theor. Phys. 94, 581–592 (2002). https://doi.org/10.1134/1.1469157
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DOI: https://doi.org/10.1134/1.1469157