The origin of the structural transition in double-perovskite manganite PrBaMn2O6

Ground-state structure, orbital ordering and metal-insulator transition in double-perovskite PrBaMn2O6

“…However, as was shown later these transitions occur at different temperatures [27]. Recently some of us studied the origin of structural transition in PrBaMn 2 O 6 and revealed that the transition is caused by the splitting of -doublet due to the tendency towards orbital ordering at the metalinsulator transition [23]. However, no conclusive evidences of this mechanism have been obtained.…”

“…Among such compounds, RBaMn 2 O 6 ones, where R=rare earth, are of special interest. Due to the large difference in atomic radii of Ba and R, these materials demonstrate pronounced magnetoresistive and magnetocaloric effects, and relatively high temperatures of magnetic phase transitions, which makes them promising candidates for practical uitilization [15][16][17][18][19][20][21][22][23].…”

“…1. However, recent studies revealed that for R=(Nd, Pr) the situation can be more complicated [16,17,20,21,23]. Investigations of powder (Nb, Pr)BaMn 2 O 6 samples showed that they transform under cooling from high-temperature paramagnetic phase to ferromagnetic metal and subsequently to the AFM-A phase [25,26].…”

Ground-state structure, orbital ordering and metal-insulator transition in double-perovskite PrBaMn2O6

“…Among such compounds, RBaMn 2 O 6 ones, where R=rare earth, are of special interest. Due to the large difference in atomic radii of Ba and R, these materials demonstrate pronounced magnetoresistive and magnetocaloric effects, and relatively high temperatures of magnetic phase transitions, which makes them promising candidates for practical uitilization [15][16][17][18][19][20][21][22][23].…”

“…1. However, recent studies revealed that for R=(Nd, Pr) the situation can be more complicated [16,17,20,21,23]. Investigations of powder (Nb, Pr)BaMn 2 O 6 samples showed that they transform under cooling from high-temperature paramagnetic phase to ferromagnetic metal and subsequently to the AFM-A phase [25,26].…”