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- W2321192085 abstract "The linear dependence on temperature $(ensuremath{gamma}T)$ of the heat capacity at low temperatures $(T<15phantom{rule{0.16em}{0ex}}mathrm{K})$ is traditionally attributed to conduction electrons in metals; however, many insulators also exhibit a linear dependence that has been attributed to a variety of other physical properties. The property most commonly used to justify the presence of this linear dependence is lattice vacancies, but a correlation between these two properties has never been shown, to our knowledge. We have devised a theory that justifies a linear heat capacity as a result of lattice vacancies, and we provide measured values and data from the literature to support our arguments. We postulate that many small Schottky anomalies are produced by a puckering of the lattice around these vacancies, and variations in the lattice caused by position or proximity to some form of structure result in a distribution of Schottky anomalies with different energies. We present a mathematical model to describe these anomalies and their distribution based on literature data that ultimately results in a linear heat capacity. From these calculations, a quantitative relationship between the linear term and the concentration of lattice vacancies is identified, and we verify these calculations using values of $ensuremath{gamma}$ and vacancy concentrations for several materials. We have compiled many values of $ensuremath{gamma}$ and vacancy concentrations from the literature which show several significant trends that provide further evidence for our theory." @default.
- W2321192085 created "2016-06-24" @default.
- W2321192085 creator A5003554239 @default.
- W2321192085 creator A5042237475 @default.
- W2321192085 date "2015-01-29" @default.
- W2321192085 modified "2023-09-29" @default.
- W2321192085 title "Lattice vacancies responsible for the linear dependence of the low-temperature heat capacity of insulating materials" @default.
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- W2321192085 doi "https://doi.org/10.1103/physrevb.91.024109" @default.
- W2321192085 hasPublicationYear "2015" @default.
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