Magnetic reconstructions in B-site doped manganites

Abstract

The magnetic nature of the B-site dopants controls the magnetic phases in B-site doped manganites RE1−xAExMn1−ηBηO3. Different B-site dopants of equal valence, doped into the same reference manganite, lead to different magnetic phases at low temperature, which can not be explained using the valence change scenario. We focus on trivalent B-site dopants in CE-CO-OO-I manganites at half-filling x = 0.50 to study the role of magnetic interactions between the B-site dopants and the neighboring Mn-sites by using a two-orbital double-exchange model including super-exchange interactions, Jahn-Teller lattice distortions and substitutional disorder in two dimensions. We show that the magnetic reconstructions around the B-site dopants due to the modified double-exchange and super-exchange interactions control the phase competition in B-site doped manganites.

Fe ion doping effects on structure, magnetic and transport properties of La0.7Ca0.3Mn1−xFexO3 (0≤x≤0.10) thin films on Si substrates

“…The physical origins of these properties are considered to be double-exchange mechanism and electron-phonon coupling arising from the Jahn-Teller distortion [5,6]. An interesting way to modify the physical properties of this material is to introduce impurity at Mn site, which is indeed the core of Mn 3 þ -O 2 À -Mn 4 þ double-exchange network [1,7]. To date, many ions (Fe, Ti, Co, Cr, Ni etc.)…”