Experimental and theoretical evaluation of the phonon thermal conductivity of niobium at intermediate temperatures

Williams, R. K.; Butler, W. H.; Graves, R.S.; Moore, J. P.

doi:10.1103/physrevb.28.6316

Cited by 35 publications

(10 citation statements)

References 26 publications

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“…, where ( ) L T is the ratio of electrical resistivity to thermal conductivity for defect free bulk Nb 26 , and ( ) T ρ is the electrical resistivity of defect-free-bulk Nb 26 . These two thermal resistances will add in series.…”

Section: μωmentioning

confidence: 99%

Experimental Validation of the Interfacial Form of the Wiedemann-Franz Law

Wilson

Cahill

2012

Phys. Rev. Lett.

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The thermal conductivity of four Pd/Ir metal multilayers of total thickness 390 nm with 40, 80, 120, and 200 Pd/Ir interfaces are measured at temperatures between 78 and 295 K using time-domain thermoreflectance. The thermal interface conductance G of the Pd/Ir interface is derived from the differences in thermal conductivity between the multilayers. A comparison of G to previously reported data for the electronic specific resistance of the Pd/Ir interface at 4 K supports the validity of the interfacial form of the Wiedemann-Franz law. The Lorenz number deduced from this comparison is within 10% of the Sommerfeld value at all temperatures, well within the experimental uncertainties of ≈ 20%.

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Section: μωmentioning

confidence: 99%

Experimental Validation of the Interfacial Form of the Wiedemann-Franz Law

Wilson

Cahill

2012

Phys. Rev. Lett.

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“…Moreover, our single crystal X-ray diffraction measurement also suggests that Cu atoms have substantial third-order Debye-Waller factors, which provides further evidence of the strong anharmonicity of Cu-involved vibrations, as listed in Table 1. The values of U222 and U333 are 0.0025(6) Å 3 and 0.00090(13) Å 3 while U111 is as small as 0.0006(4) Å 3 . Such a difference is consistent with the second-order Debye-Waller factors listed in Supplementary Fig.…”

mentioning

confidence: 93%

“…Materials with low thermal conductivity are desirable for a great variety of applications such as thermal insulation 2 , phase transition memory devices 3 , and thermoelectric energy conversion 4 . In electrically insulating nonmagnetic systems, phonons are the major heat carrier, and lattice thermal conductivity is proportional to the product of the square of sound speeds and phonon lifetimes 5 – 7 . To decrease the thermal conductivity, a general approach is to reduce the phonon lifetimes through enhancing phonon–phonon and phonon-disorder scattering.…”

Section: Introductionmentioning

confidence: 99%

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Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor

Dong

Zhang

et al. 2020

Nat Commun

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A solid with larger sound speeds usually exhibits higher lattice thermal conductivity. Here, we report an exception that CuP2 has a quite large mean sound speed of 4155 m s−1, comparable to GaAs, but single crystals show very low lattice thermal conductivity of about 4 W m−1 K−1 at room temperature, one order of magnitude smaller than GaAs. To understand such a puzzling thermal transport behavior, we have thoroughly investigated the atomic structures and lattice dynamics by combining neutron scattering techniques with first-principles simulations. This compound crystallizes in a layered structure where Cu atoms forming dimers are sandwiched in between P atomic networks. In this work, we reveal that Cu atomic dimers vibrate as a rattling mode with frequency around 11 meV, which is manifested to be remarkably anharmonic and strongly scatters acoustic phonons to achieve the low lattice thermal conductivity.

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“…There have been numerous experimental measurements and theoretical analysis in order to understand the thermal transport in metals ever since the early of the twentieth century [1][2][3][4][5][6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Comprehensive first-principles analysis of phonon thermal conductivity and electron-phonon coupling in different metals

et al. 2019

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Separating electron and phonon thermal conductivity components is imperative for understanding the principle thermal transport mechanisms in metals and highly desirable in many applications. In this work, we predict the mode-dependent electron and phonon thermal conductivities of 18 different metals at room-temperature from first-principles. Our first-principles predictions in general agree well with experimental data. We find that the phonon thermal conductivity is in the range of 2 -18 W/mK, which accounts for 1% -40% of the total thermal conductivity. It is also found that the phonon thermal conductivities in transition metals and transition-intermetallic-compounds (TICs) are non-negligible compared to noble metals due to their high phonon group velocities. Besides, the electron-phonon coupling effect on phonon thermal conductivity in transition metals and intermetallic compounds is stronger than that of nobles, which is attributed to larger electron-phonon coupling constant with a high electron density of state within Fermi window and high phonon frequency. The noble metals have higher electron thermal conductivities compared to transition metals and TICs, which is mainly due to the weak electronphonon coupling in noble metals. It is also shown that the Lorenz ratios of transition metals and transition-intermetallic-compounds hold larger deviations from the Sommerfeld value L 0 =2.44×10 -8 WK -2 . We also find the mean free paths (MFPs) for phonon (within 10 nm) are smaller than those of electron (5 -25 nm). The electrical conductivity and electron thermal conductivity are strongly related to the MFPs of electron.

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Experimental and theoretical evaluation of the phonon thermal conductivity of niobium at intermediate temperatures

Cited by 35 publications

References 26 publications

Experimental Validation of the Interfacial Form of the Wiedemann-Franz Law

Experimental Validation of the Interfacial Form of the Wiedemann-Franz Law

Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor

Comprehensive first-principles analysis of phonon thermal conductivity and electron-phonon coupling in different metals

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