Magnetic and transport properties of (La0.4Eu0.6)0.7Pb0.3MnO3 single crystal: The key role of intrinsic inhomogeneity

The magnetic and transport measurements of the mixed-valence manganite (La0.4Eu0.6)0.7Pb0.3MnO3 have been supplemented by magnetic resonance study. Experimental data support the model of two magnetic phases coexisting in the crystal volume. Above TC=119K, up to 1.6TC ferromagnetic (FM) clusters of minority phase exist in a paramagnetic matrix of majority phase. Below TC a magnetic state represents the coexistence of two different FM phases. These phases are observed as a spatially separated due to the frustration of the FM and antiferromagnetic (AFM) exchange interactions on the phase boundaries. Phase separation state comprised of two different magnetic phases differing in the conductivity has been used to account for the peculiarities of the transport, magnetotransport, magnetic and magnetic resonance properties found in the crystal