Abstract
Phase transitions observed in electronic systems of solids in the vicinity of the quantum critical point where the effective mass diverges are analyzed within the framework of the theory of fermion condensation. It is shown that the disordered phase contains a fermion condensate. Its entropy is finite at T → 0 and initiates a chain of transitions occurring at extremely low temperatures. The results are in agreement with experiment.
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Original Russian Text © V.A. Khodel, M.V. Zverev, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 8, pp. 489–494.