Negative imaginary component of AC magnetic susceptibility, metastable states, and magnetic relaxation in La0.6Sr0.35MnTi0.05O3

Abstract

Off-stoichiometric ([Formula: see text][Formula: see text])([Formula: see text]) MnO3 manganite was studied with in-phase (real, [Formula: see text]) and out-of-phase (imaginary, [Formula: see text]) components of ac susceptibility measurements. Short- and long-time relaxation effects, manifested by the revealed negative [Formula: see text], were observed. The effects are explained at the frame of Landau theory of phase transitions where a coexistence of stable and metastable states is considered. It is supposed that the appearance of negative [Formula: see text] is an intrinsic feature of magnetic materials with impurities, defects and vacancies blocking nucleation and growth of new phase.