2008/08/12 by T. F. Schulze, M. Brühwiler, M. Bruehwiler +9 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced Thermoelectric Materials and Devices #Condensed matter physics #Electron #Fermi level #Fermi surface #Heat capacity #Materials science #Muon spin spectroscopy #Nuclear magnetic resonance #Nuclear physics #Photoemission spectroscopy #Physics #Physics of Superconductivity and Magnetism #Spin (aerodynamics) #Superconductivity #Thermodynamics #X-ray photoelectron spectroscopy #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.205101
9 pages, 5 figures
arxiv created 2008/08/12 · openalex publication_date 2008/11/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this study an extended low-energy phase diagram for NaxCoO2 is experimentally established with emphasis on the high-x range. It is based on systematic heat-capacity studies on both polycrystalline and single-crystalline samples and on muon-spin-rotation measurements. Main features are the existence of mass enhancement, spin fluctuations without long-range order, and magnetic order with associated Fermi surface gapping. The latter is seen in the electronic density of states (DOS) and suppression of nuclear specific heat. While there is agreement between the band structure and the low-energy DOS in the low-x range, in the high-x range (x\ensuremath≥0.6) the thermodynamically determined DOS is approximately three times that deduced from the angle-resolved-photoemission-spectroscopy-measured band dispersion or local-density approximation calculations.