Cooling rate dependence of the antiferromagnetic domain structure of a single crystalline charge ordered manganite
Abstract
The low temperature phase of single crystals of Nd0.5Ca0.5MnO3 and Gd0.5Ca0.5MnO3 manganites is investigated by squid magnetometry. Nd0.5Ca0.5MnO3 undergoes a charge-ordering transition at TCO=245K, and a long range CE-type antiferromagnetic state is established at TN=145K. The dc-magnetization shows a cooling rate dependence below TN, associated with a weak spontaneous moment. The associated excess magnetization is related to uncompensated spins in the CE-type antiferromagnetic structure, and to the presence in this state of fully orbital ordered regions separated by orbital domain walls. The observed cooling rate dependence is interpreted to be a consequence of the rearrangement of the orbital domain state induced by the large structural changes occurring upon cooling.
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