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The magnetic field and pressure dependence of the magnetic ordering transition in NaxCoO2 (0.6 <= x <= 0.72)
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Wooldridge, Jenny, Paul, Don McK., Balakrishnan, Geetha and Lees, Martin R. (2006) The magnetic field and pressure dependence of the magnetic ordering transition in NaxCoO2 (0.6 <= x <= 0.72). Journal of Physics-Condensed Matter, Volume 18 (Number 19). pp. 4731-4739. doi:10.1088/0953-8984/18/19/024
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Official URL: http://dx.doi.org/10.1088/0953-8984/18/19/024
Abstract
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 NaxCoO2 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.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Journal or Publication Title: | Journal of Physics-Condensed Matter | ||||||||
| Publisher: | IOP Publishing | ||||||||
| ISSN: | 0953-8984 | ||||||||
| Official Date: | 27 April 2006 | ||||||||
| Dates: |
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| Volume: | Volume 18 | ||||||||
| Number: | Number 19 | ||||||||
| Number of Pages: | 9 | ||||||||
| Page Range: | pp. 4731-4739 | ||||||||
| DOI: | 10.1088/0953-8984/18/19/024 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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