New low-temperature phases in NaxCoO2 linked to quantum criticality

F. Rivadulla; M. Banobre-Lopez; M. Garcia-Hernandez; M. A. Lopez-Quintela; J. Rivas

New low-temperature phases in NaxCoO2 linked to quantum criticality

Strongly Correlated Electrons 2007-05-23 v1 Superconductivity

Authors: F. Rivadulla , M. Banobre-Lopez , M. Garcia-Hernandez , M. A. Lopez-Quintela , J. Rivas

Abstract

New electronic phases have been identified and placed in the (T,H) phase diagram of metallic NaxCoO2. At low Na-content (x = 0.36), the magnetic susceptibility diverges with a power law T^(-n), n<1, and shows (T,H) scaling, indicating the proximity to a magnetic quantum phase transition. At high Na contents (x = 0.6) the mass of the quasiparticles does never diverge, but renormalizes and becomes strongly field dependent at low temperatures, forming a heavy Fermi-Liquid. Our results make superconducting NaxCoO2 a clear candidate for magnetically mediated pairing.

Keywords

NaxCoO2 quantum criticality magnetic susceptibility heavy Fermi liquid superconductivity

Cite

@article{arxiv.cond-mat/0503010,
  title  = {New low-temperature phases in NaxCoO2 linked to quantum criticality},
  author = {F. Rivadulla and M. Banobre-Lopez and M. Garcia-Hernandez and M. A. Lopez-Quintela and J. Rivas},
  journal= {arXiv preprint arXiv:cond-mat/0503010},
  year   = {2007}
}

New low-temperature phases in NaxCoO2 linked to quantum criticality

Abstract

Keywords

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