Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2
Journal Article
·
· Physical Review B
- Montana State University
- National Center for Biotechnology Information
- ORNL
High-resolution thermal expansion measurements of single-crystalline Na0.80CoO2 reveal continuous behavior of the paramagnetic-antiferromagnetic phase transition at TM=21.7(1) K with critical exponent a=0.18(2). The thermal expansion is found to be highly anisotropic. Thermodynamic analysis provides the hydrostatic pressure derivative dTM/dP=+4.6(2) K/GPa. Similar measurements and analysis are presented for Na0.75CoO2.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1003682
- Journal Information:
- Physical Review B, Vol. 74, Issue 13; ISSN 1098--0121
- Country of Publication:
- United States
- Language:
- English
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