Spin fluctuations, magnetic long-range order, and Fermi surface gapping in Na(x)CoO(2)статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In this study an extended low-energy phase diagram for Na(x)CoO(2) 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 >= 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.