Irreversible electronic and magnetic transformations in colossal magnetoresistance compositions close to charge ordering

Correlating melting and collapse of charge ordering with magnetic transitions in La 0.5-x Pr x Ca 0.5 MnO 3

“…LCMO is reported to exhibit change in crystal symmetry (T C = 225 K) along with a transition from paramagnetic (PM) to ferromagnetic metal (FMM) and then further to a charge exchange type antiferromagnetic insulating (CE-AFI) phase below T N = 155 K [6,12]. PCMO is among the most interesting materials due to its appealing electrical and magnetic properties showing charge and orbital ordering along with CE-AFI phases at T CO = 245 K and T N = 155 K, respectively [13,14].…”

“…Depending upon the thermal and magnetic history, LCMO exhibits a competition between FM and antiferromagnetic (AFM) states [6,10] in both tetragonal as well as orthorhombic structures [11,12] with growth of nano phase regions below T C [1]. LCMO is reported to exhibit change in crystal symmetry (T C = 225 K) along with a transition from paramagnetic (PM) to ferromagnetic metal (FMM) and then further to a charge exchange type antiferromagnetic insulating (CE-AFI) phase below T N = 155 K [6,12].…”

Magnetic anisotropy-induced spin-reorientation in spinel FeCr2S4

“…the manganese oxides with phase separation character, and can be attributed to the martensitic-like transformation resulted from the coexistence and competition of antiferromagnetic and ferromagnetic phases [14,15]. Due to the competition of different phases, the measured magnetization depends on not only the cycling direction but also the cycling times [14][15][16][17][18]. However, for FeCr 2 S 4 , thermal cycling for three times has no evident change on the irreversible behavior, see Fig.…”

“…In addition, it should be mentioned that all the cycling measurements were performed at the same measuring rate, therefore the spin relaxation has not been considered. Nevertheless, if we changed the measuring rate among different cycles, additional irreversible behavior due to spin relaxation might be expected [18].…”

Revival of metastable behavior in phase separated La0.5Ca0.5MnO3+δ

“…The CMR composition La 0.5 Ca 0.5 MnO 3 represents the boundary between competing ferromagnetic (FM) and charge ordered anti-ferromagnetic (CO-AFM) ground states [2,5]. At this boundary the FM-metallic state becomes unstable to an insulating CO-AFM state [6,7]. The physical properties close to this phase boundary arise from a strong competition among ferromagnetic double exchange interaction, an antiferromagnetic superexchange interaction, and the spin-phonon coupling [8][9][10][11][12].…”