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Critical exponents of EuTe from specific-heat and thermal-expansion measurements

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Scheer, E., Wosnitza, J., von Löhneysen, H., Kürsch, R., Lang, M., & Steglich, F. (1992). Critical exponents of EuTe from specific-heat and thermal-expansion measurements. Journal of Magnetism and Magnetic Materials, 104, 175-176. doi:10.1016/0304-8853(92)90753-B.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D702-B
Abstract
The antiferromagnet EuTe shows a distinct cross-over behavior in the specific heat C when approaching the Neel temperature T(N) = 9.8 K. For \t\ = \(T - T(N))/T(N) \ > 0.01 the critical exponent of the specific heat, C alpha \t\-alpha, is almost zero, alpha = 0.0085 +/- 0.003. Closer to T(N), for 0.0015 < \t\ < 0.01, C exhibits a different behavior with a surprisingly large positive alpha = 0.38 +/- 0.1, considerably exceeding even the d = 3 Ising exponent alpha = 0.11. Measurements of the thermal expansion yield essentially the same cross-over behavior with alpha = 0.002 +/- 0.01 for \t\ > 0.01 and alpha = 0.43 +/- 0.2 for 0.001 < \t\ < 0.03. Although EuTe is considered to be a Heisenberg antiferromagnet, some anisotropy might be expected because of dipolar interactions, possibly causing the observed cross-over.