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Shubnikov de Haas oscillations for two well defined frequencies,corresponding respectively to areas of 0.8 and 1.36% of the first Brillouinzone (FBZ), were observed in single crystals of Na$_{0.3}$CoO$_2$. Theexistence of Na superstructures in Na$_{0.3}$CoO$_2$, coupled with thisobservation, suggests the possibility that the periods are due to thereconstruction of the large Fermi surface around the $\Gamma$ point. Analternative interpretation in terms of the long sought-after$\epsilon_g^\prime$ pockets is also considered but found to be incompatiblewith existing specific heat data.Comment: 5 pages 4 figure

physical review letters

Shubnikov–de Haas Effect in the Metallic State of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Na</mml:mi><mml:mn>0.3</mml:mn></mml:msub><mml:msub><mml:mi>CoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Shubnikov–de Haas Effect in the Metallic State ofNa0.3CoO2