Mass-enhanced Fermi-liquid ground state in Na1.5Co2O4
Abstract
Magnetic, transport, and specific-heat measurements have been performed on layered metallic oxide Na1.5Co2O4 as a function of temperature T. Below a characteristic temperature T*=30-40 K, electrical resistivity shows a metallic conductivity with a T2 behavior and magnetic susceptibility deviates from the Curie-Weiss behavior showing a broad peak at ∼14 K. The electronic specific-heat coefficient γ is ∼60 mJ/mol K2 at 2 K. No evidence for magnetic ordering is found. These behaviors suggest the formation of mass-enhanced Fermi-liquid ground state analogous to that in d-electron heavy fermion compound LiV2O4.
- Publication:
-
Physical Review B
- Pub Date:
- April 2004
- DOI:
- 10.1103/PhysRevB.69.132412
- arXiv:
- arXiv:cond-mat/0403028
- Bibcode:
- 2004PhRvB..69m2412M
- Keywords:
-
- 75.40.Cx;
- 75.20.Hr;
- 71.27.+a;
- Static properties;
- Local moment in compounds and alloys;
- Kondo effect valence fluctuations heavy fermions;
- Strongly correlated electron systems;
- heavy fermions;
- Strongly Correlated Electrons;
- Materials Science
- E-Print:
- 4 pages, 4 figures, to be published in Phys. Rev. B 69 (2004)