Abstract
The effects of the excitonic fluctuation on the various transport coefficients are studied theoretically. Use is made of the two-band model to describe the excitonic correlation. It is shown that the contributions arising from the fluctuation to the electric conductivity, the thermal conductivity, the thermoelectric power, and the nuclear spin lattice relaxation rate do not diverge but their temperature derivatives diverge as[(T N /T−T N )]1/2 as the temperature approachesT N , the transition temperature. It is also shown that the excitonic transition (which includes the antiferromagnetic transition of Cr as well as its alloys) is another example, besides the superconducting transition, where the mean field theory offers valid description of the fluctuation phenomena near the transition.
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On leave of absence from Department of Physics, Tohoku University, Sendai, Japan.
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Béal-Monod, M.T., Maki, K. & Fukuyama, H. Effects of the excitonic fluctuations above the transition temperature. J Low Temp Phys 9, 73–95 (1972). https://doi.org/10.1007/BF00655487
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DOI: https://doi.org/10.1007/BF00655487