Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2

Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2

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...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-10, Vol.74 (13)
Hauptverfasser: dos Santos, C. A. M., Neumeier, J. J., Bollinger, R. K., Yu, Yi-Kuo, Jin, Rongying, Mandrus, David, Sales, Brian C
Format: Artikel
Sprache:eng
Schlagworte:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
HYDROSTATICS
THERMAL EXPANSION
THERMODYNAMICS
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Zusammenfassung: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.74.132402