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Discontinuous Lifshitz Transition Achieved by Band-Filling Control in NaxCoO2

Precise band-filling control is performed on a strongly correlated electron system NaxCoO2, by changing the Na content, and the influence of this on the magnetic and thermodynamic properties is studied. It has been discovered that a phase boundary between a Pauli paramagnetic metal appearing at small x and a Curie-Weiss metal at large x is located within an extremely narrow range of 0.620 < x < 0.621. The transition between these is a Lifshitz transition of the pocket-vanishing type, exceptionally achieved by band-filling control. Abrupt changes in various properties across the boundary are remarkably observed, suggesting that the Lifshitz transition occurs discontinuously in NaxCoO2, differently from the conventional Lifshitz transition defined at T = 0.

preprint2010arXivOpen access
Yoshihiko OkamotoAtsushi NishioZenji Hiroi
cond-mat.str-el
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Yoshihiko OkamotoAtsushi NishioZenji Hiroi

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