Pressure effects on superconducting and magnetic transitions in layered sodium cobalt oxides, NaxCoO2

Abstract

The results of dc magnetization measurements under hydrostatic (heliumgas) pressure are presented for an ambient pressure superconductor Nao35CoOel.4D20 and its precursor compound NaoTsCo02 known to combine metallic conductivity with an unusual magnetic state below ~22K. PACS numbers: 74.62.Fj, 75.20. En, 75.50Ee, 75.30Kz.