Abstract
The crystal structure and electromagnetic properties of the A-site ordered perovskite manganite, TbBaMn2O6, have been studied. TbBaMn2O6 has successive phase transitions; the structural transition at Tt=450 K, the charge/orbital order transition at TCO =430 K and the antiferromagnetic transitions on Mn ions at TN=210 K and on Tb ions at TN=12 K. At Tt, both a- and b-axis expand by 0.7%, and the c-axis shrinks by 1.3% in the low-temperature phase. The magnetic interaction changes from ferromagnetic (the high-temperature triclinic phase) to antiferromagnetic (the low-temperature monoclinic phase) across Tt. The electrical resistivity clearly shows anisotropic behaviors at Tt; an increase of resistivity along the c-axis and no change within the ab-plane. The obtained results strongly suggest the dx2−y2-type orbital order at Tt.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
