NMR study of the magnetic and metal-insulator transitions in Na0.5CoO2: a nesting scenario

Details NMR study of the magnetic and metal-insulator transitions in Na0.5CoO2: a nesting scenario NMR study of the magnetic and metal-insulator transitions in Na0.5CoO2: a nesting scenario

2005-07-22

arxiv.org/abs/cond-mat/0507514v2

Phys.Rev.Lett. 96, 1072001 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.107201

Co and Na NMR are used to probe the local susceptibility and charge state of the two Co sites of the Na-ordered orthorhombic Na0.5CoO2. Above T_N=86K, both sites display a similar T-dependence of the spin shift, suggesting that there is no charge segregation into Co3+ and Co4+ sites. Below T_N, the magnetic long range commensurate order found is only slightly affected by the metal-insulator transition (MIT) at T_MIT=51K. Furthermore, the electric field gradient at the Co site does not change at these transitions, indicating the absence of charge ordering. All these observations can be explained by successive SDW induced by two nestings of the Fermi Surface specific to the x=0.5 Na-ordering.

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