Comparative study on the specific heat of ferroelectrics with a structural quantum critical point

The low-temperature behavior of the lattice specific heat near structural quantum critical points (sQCPs) is compared between Sr 1– x Ca x TiO 3 and Ba 1– x Sr x Al 2 O 4 with optical and acoustic soft modes, respectively. We will show that the low–temperature lattice specific heat of Sr 1– x Ca x T...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2022-11, Vol.61 (SN), p.SN1017
Main Authors: Ishii, Yui, Yamamoto, Arisa, Mori, Shigeo
Format: Article
Language:English
Subjects:
Comparative studies
Critical point
Debye temperature
Ferroelectric materials
Ferroelectricity
Lattice vibration
Low temperature
quantum paraelectrics
Specific heat
structural quantum critical point
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Summary:The low-temperature behavior of the lattice specific heat near structural quantum critical points (sQCPs) is compared between Sr 1– x Ca x TiO 3 and Ba 1– x Sr x Al 2 O 4 with optical and acoustic soft modes, respectively. We will show that the low–temperature lattice specific heat of Sr 1– x Ca x TiO 3 is almost independent of the Ca concentration, although a small dip appears in the Debye temperature (Θ D ) at x = 0.001 near the sQCP composition. This behavior is in sharp contrast to that of Ba 1– x Sr x Al 2 O 4 that exhibits a large decrease in Θ D toward the sQCP. These results indicate that the character of the soft mode significantly affects the thermal nature at the sQCP.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac8047