In-plane ferromagnetism in charge-ordering $Na_{0.55}CoO_2$

C. H. Wang; X. H. Chen; T. Wu; X. G. Luo; G. Y. Wang; J. L. Luo

doi:10.1103/PhysRevLett.96.216401

In-plane ferromagnetism in charge-ordering $Na_{0.55}CoO_2$

Strongly Correlated Electrons 2009-11-11 v1 Superconductivity

Authors: C. H. Wang , X. H. Chen , T. Wu , X. G. Luo , G. Y. Wang , J. L. Luo

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Abstract

The magnetic and transport properties are systematically studied on the single crystal $Na_{0.55}CoO_2$ with charge ordering and divergency in resistivity below 50 K. A long-range ferromagnetic ordering is observed in susceptibility below 20 K with the magnetic field parallel to Co-O plane, while a negligible behavior is observed with the field perpendicular to the Co-O plane. It definitely gives a direct evidence for the existence of in-plane ferromagnetism below 20 K. The observed magnetoresistance (MR) of 30 % at the field of 6 T at low temperatures indicates an unexpectedly strong spin-charge coupling in triangle lattice systems.

Keywords

in-plane ferromagnetism charge ordering Na0.55CoO2 magnetoresistance spin-charge coupling

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@article{arxiv.cond-mat/0512507,
  title  = {In-plane ferromagnetism in charge-ordering $Na_{0.55}CoO_2$},
  author = {C. H. Wang and X. H. Chen and T. Wu and X. G. Luo and G. Y. Wang and J. L. Luo},
  journal= {arXiv preprint arXiv:cond-mat/0512507},
  year   = {2009}
}

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4 pages, 5 figures

In-plane ferromagnetism in charge-ordering $Na_{0.55}CoO_2$

Abstract

Keywords

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