2005/10/31 by J Wooldridge, J. Wooldridge, D. McK. Paul +5
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/18/19/024
published as J. Phys.: Condens. Matter 18 (2006) 4731-4739 · 11 pages, 6 figures. Changes made after referee comments
arxiv created 2006/04/27 · openalex publication_date 2006/04/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have measured the magnetic field ( H ≤90 kOe) and pressure ( P ≤10 kbar) dependence of the magnetic ordering temperature, T mag , in single crystal samples of Na x CoO 2 for a range of Na concentrations (0.60≤ x ≤0.72). We show that in zero field T mag remains constant with decreasing x before magnetic order disappears at x = 0.65. Heat capacity and magnetization data show that for x = 0.70 T mag is unchanged in an applied field. In contrast, magnetization data collected under hydrostatic pressure show that T mag increases from 22.0 K at 1 bar to 25.4 K at 10 kbar. This rise is at odds with the behaviour expected for model spin density wave systems.