Physics – Condensed Matter – Materials Science
Scientific paper
2007-07-23
Phys. Rev. B 76, 184432 (2007)
Physics
Condensed Matter
Materials Science
16 pages including figures
Scientific paper
10.1103/PhysRevB.76.184432
A new nanoscale ordered perovskite cobaltite, which consists of 90 degree ordered domains of the layered-112 LaBaCo2O6 has been evidenced by high resolution- transmission electron microscopy. This new form, like the disordered La0.5Ba0.5CoO3 and ordered LaBaCo2O6, exhibits a ferromagnetic transition at TC around 179 K. However, it differs from the two previous forms by its strong magnetic anisotropy, and correlatively by its high value of coercivity (0.42 Tesla) at low temperature. We suggest that this behaviour originates from the locking of magnetic spins in the 90 degree oriented nano-domain. Moreover, one observes a semi-metal/semi-metal transition at TC with a maximum magnetoresistance of 6.5 % at this temperature.
Boullay Ph.
Caignaert Vincent
Kundu Asish K.
Pralong Valerie
Rautama Eeva Leena
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