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VOLUME 35 (1982) | ISSUE 5 | PAGE 218
Possibility of anomalous fluctuations during structural phase transitions
A theory is derived for phase transitions which result from particular features of the electron spectrum (congruent parts of the Fermi surface, particularly in quasi-one-dimensional systems). If the congruence is not perfect, or if the masses in two-band systems are greatly different, the fluctuations may occur over a broad temperature range. This result can explain, for example, the anomalies in the susceptibility, compressibility, and phonon spectra in A15 compounds.