Magnetism

Magnetic and transport properties of the charge-ordered manganite Pr$_{2/3}$Ca$_{1/3}$MnO$_3$

V. A. Ryzhov^a, A. V. Lazuta^a, I. A. Kiselev^a, V. P. Khavronin^a, I. O. Troyanchuk^b, S. V. Trukhanov<sup>b

a</sup> The Petersburg Nuclear Physics Institute, The National Research Center "Kurchatov Institute"
^b Joint Institute of Solid State and Semiconductors Physics, National Academy of Sciences of Belarus, Minsk, 220072, Belarus

Abstract: The transport properties, $ac$ susceptibility $\chi$, and EPR spectra have been studied for the insulator polycrystalline manganite Pr$_{2/3}$Ca$_{1/3}$MnO$_3$ undergoing the orbital (O) and charge (C) orderings below $T_{\mathrm{CO}}\sim$ 250 K that lead to antiferromagnetic (AF) ordering below $T_N\approx$ 155 K. Above $T_C\sim$110 K, the $\chi'(T)$ dependence indicates that the sample contains a phase undergoing a second-order transition from the paramagnetic to ferromagnetic state. In the vicinity of $T_C$, the colossal magnetoresistance effect is observed. The EPR spectrum characteristics are sensitive to the development of the O/C and AF orderings, and they show peculiarities at $T_{\mathrm{CO}}$ and $T_N$. Between $T_{\mathrm{CO}}$ and $T_N$, the temperature dependence of the $g$ factor exhibits a characteristic point that can be related to the appearance of the electric polarization revealed in manganites of this class.

Received: 03.09.2010

 English version: Physics of the Solid State, 2011, 53:5, 964–969

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