Temperature dependence of the photoacoustic(PA) spectra of the thallium blue bronze near the phase transition was first measured. The anomalous behaviors of the PA amplitude and phase angle, and a peak of the specific heat and thermal conductivity (C(S)(T).K(S)(T)) in the vicinity of 180K were observed, and qualitatively provided evidence that the phase transition is a second-order phase transition in agreement with the specific heat.
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