Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6

Asish K. Kundu; E. -L. Rautama; Ph. Boullay; V. Caignaert; V. Pralong; B. Raveau

doi:10.1103/PhysRevB.76.184432

Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6

Materials Science 2011-11-10 v1 Other Condensed Matter

Authors: Asish K. Kundu , E. -L. Rautama , Ph. Boullay , V. Caignaert , V. Pralong , B. Raveau

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Abstract

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.

Keywords

perovskite magnetism magnetic materials and spin systems magnetic structure

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@article{arxiv.0707.3346,
  title  = {Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6},
  author = {Asish K. Kundu and E. -L. Rautama and Ph. Boullay and V. Caignaert and V. Pralong and B. Raveau},
  journal= {arXiv preprint arXiv:0707.3346},
  year   = {2011}
}

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16 pages including figures

Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6

Abstract

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