Abstract
The low-temperature behavior of the lattice specific heat near structural quantum critical points (sQCPs) is compared between Sr1–x Ca x TiO3 and Ba1–x Sr x Al2O4 with optical and acoustic soft modes, respectively. We will show that the low–temperature lattice specific heat of Sr1–x Ca x TiO3 is almost independent of the Ca concentration, although a small dip appears in the Debye temperature (ΘD) at x = 0.001 near the sQCP composition. This behavior is in sharp contrast to that of Ba1–x Sr x Al2O4 that exhibits a large decrease in ΘD toward the sQCP. These results indicate that the character of the soft mode significantly affects the thermal nature at the sQCP.
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