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- W2024955068 startingPage "1351" @default.
- W2024955068 abstract "The thermal and electrical conductivities $ensuremath{kappa}$ and $ensuremath{sigma}$, respectively, have been measured for chromium between approximately 1.5 and 330ifmmode^circelsetextdegreefi{}K in order to determine the Lorenz number $L=frac{ensuremath{kappa}}{ensuremath{sigma}T}$. Since at 330ifmmode^circelsetextdegreefi{}K these data agree with the higher-temperature measurements by Powell and Tye, an analysis has been developed to encompass both sets of data. Although $L$ shows the usual metallic behavior at low temperatures, at all temperature above 90ifmmode^circelsetextdegreefi{}K it is greater than the expected Sommerfeld value (${L}_{0}=2.445ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}$ ${mathrm{V}}^{2}$/${mathrm{deg}}^{2}$). It is not possible to account for this anomaly by the usual assumption of a lattice component of thermal conductivity without allowing the component itself to become anomalous. Klemens has pointed out that anomalous values of $L$ are expected in transition metals at high temperatures because the Fermi skin begins to encompass their complicated band structure. Analysis of $L(mathrm{Cr})$ in these terms shows that the transport coefficients can be separated into two factors: one which has the temperature dependence of single definite scattering processes above and below the N'eel temperature, and another which is the integral of a quantity that has the characterisitics of the known band structure. Since this integral is temperature-dependent, it is possible to state that certain anomalies in the transport properties of chromium are due to its band structure. It appears that above the Ne'el temperature Cr may be approaching nondegeneracy." @default.
- W2024955068 created "2016-06-24" @default.
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- W2024955068 date "1970-02-15" @default.
- W2024955068 modified "2023-10-16" @default.
- W2024955068 title "Lorenz Number of Chromium" @default.
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- W2024955068 doi "https://doi.org/10.1103/physrevb.1.1351" @default.
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