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Kwok, R.S.; Brown, Stuart

doi:10.1103/physrevlett.63.895

Cited by 67 publications

(27 citation statements)

References 18 publications

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“…[10] Figure 1(a) shows that κ el decreases approximately linearly as the temperature is reduced, and like ρ(T ), displays a weak anomaly at T N . Measurements carried out on charge-density wave (CDW) systems K 0.3 MoO 3 and (TaSe 4 ) 2 I, [17] find only a small cusp in κ ph but not in κ el with the onset of the lattice distortion associated with the CDW, just as we observe at the SDW transition in CaFe 4 As 3 . The softening of the phonons that drive CDWs, and to a lesser extent SDWs, is thought to be responsible for the reduced values of κ ph found in the ordered state T ≤ T N ( Fig.…”

Section: Resultssupporting

confidence: 61%

Thermal and electrical transport in the spin density wave antiferromagnet CaFe4As3

et al. 2011

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We present here measurements of the thermopower, thermal conductivity, and electrical resistivity of the newly reported compound CaFe4As3. Evidence is presented from specific heat and electrical resistivity measurements that a substantial fraction of the Fermi surface survives the onset of spin density wave (SDW) order at the Néel temperature TN=88 K, and its subsequent commensurate lockin transition at T2=26.4 K. The specific heat below T2 consists of a normal metallic component from the ungapped parts of the Fermi surface, and a Bardeen-Cooper-Schrieffer (BCS) component that represents the SDW gapping of the Fermi surface. A large Kadowaki-Woods ratio is found at low temperatures, showing that the ground state of CaFe4As3 is a strongly interacting Fermi liquid. The thermal conductivity κ of CaFe4As3 is an order of magnitude smaller than those of conventional metals at all temperatures, due to a strong phonon scattering. The thermoelectric power S displays a sign change from positive to negative indicating that a partial gap forms at the Fermi level with the onset of commensurate spin density wave order at T2 = 26.4 K. The small value of the thermopower S and the enhancements of the resistivity due to gap formation and strong quasiparticle interactions offset the low value of the thermal conductivity κ, yielding only a modest value for the thermoelectric figure of merit Z ≤ 5 × 10The results of ab initio electronic structure calculations are reported, confirming that the sign change in the thermopower at T2 is reflected by a sign change in the slope of the density of states at the Fermi level. Values for the quasiparticle renormalization Z are derived from measurements of the specific heat and thermopower, indicating that as T → 0, CaFe4As3 is among the most strongly correlated of the known Fe-based pnictide and chalcogenide systems.

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Section: Resultssupporting

confidence: 61%

Thermal and electrical transport in the spin density wave antiferromagnet CaFe4As3

et al. 2011

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“…Analogous behavior of lattice thermal conductivity was only observed in a few works [32][33][34]. The authors of [33] studied C p (T) and k ph (T) of an K 0.3 MnO 3 alloy, where a structural Peierls phase transition and related charge density waves take place.…”

Section: Methodsmentioning

confidence: 69%

“…The authors of [33] studied C p (T) and k ph (T) of an K 0.3 MnO 3 alloy, where a structural Peierls phase transition and related charge density waves take place. Both a specific heat jump (ΔC p /C p = 6%) and a thermal conductivity jump (Δk/k = 5%) were detected near the Peierls phase transition, and they were thought to be associated with an increase in the number of acoustic phonons near the transition.…”

Section: Methodsmentioning

confidence: 99%

Magnetic, thermal, and electrical properties of an Ni45.37Mn40.91In13.72 Heusler alloy

Batdalov

Aliev

Khanov

et al. 2016

J. Exp. Theor. Phys.

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The magnetization, the electrical resistivity, the specific heat, the thermal conductivity, and the thermal diffusion of a polycrystalline Heusler alloy Ni 45.37 Mn 40.91 In 13.72 sample are studied. Anomalies, which are related to the coexistence of martensite and austenite phases and the change in their ratio induced by a magnetic field and temperature, are revealed and interpreted. The behavior of the properties of the alloy near Curie temperature T C also demonstrates signs of a structural transition, which suggests that the detected transition is a first-order magnetostructural phase transition. The nontrivial behavior of specific heat detected near the martensite transformation temperatures is partly related to a change in the electron density of states near the Fermi level. The peculiar peak of phonon thermal conductivity near the martensitic transformation is interpreted as a consequence of the appearance of additional soft phonon modes, which contribute to the specific heat and the thermal conductivity.

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“…30 Although recent MD simulations on the thermal conductivity of nanotubes have provided deep insights into the correlation between k and quantities such as the tube length, diameter, or temperature, one possible key parameter has not been considered up to now. It is the influence of the bond length or-even more importantly-the bond length alternation on k. Experimental studies of quasi-1D organic molecular crystals 31 and low-dimensional inorganic transition metal oxides [32][33][34][35][36] have shown that k can be influenced sizably by dimerization or distortion processes. Bond length alternations as well as other types of symmetry reductions in CNTs have been studied in detail by electronic band structure calculations.…”

Section: Introductionmentioning

confidence: 99%

Correlation between thermal conductivity and bond length alternation in carbon nanotubes: A combined reverse nonequilibrium molecular dynamics—Crystal orbital analysis

et al. 2010

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The thermal conductivity (λ) of carbon nanotubes (CNTs) with chirality indices (5,0), (10,0), (5,5), and (10,10) has been studied by reverse nonequilibrium molecular dynamics (RNEMD) simulations as a function of different bond length alternation patterns (Δr(i) ). The Δr(i) dependence of the bond force constant (k(rx) ) in the molecular dynamics force field has been modeled with the help of an electronic band structure approach. These calculations show that the Δr(i) dependence of k(rx) in tubes with not too small a diameter can be mapped by a simple linear bond length-bond order correlation. A bond length alternation with an overall reduction in the length of the nanotube causes an enhancement of λ, whereas an alternation scheme leading to an elongation of the tube is coupled to a decrease of the thermal conductivity. This effect is more pronounced in carbon nanotubes with larger diameters. The formation of a polyene-like structure in the direction of the longitudinal axis has a negligible influence on λ. A comparative analysis of the RNEMD and crystal orbital results indicates that Δr(i) -dependent modifications of λ and the electrical conductivity are uncorrelated. This behavior is in-line with a heat transfer that is not carried by electrons. Modifications of λ as a function of the bond alternation in the (10,10) nanotube are explained with the help of power spectra, which provide access to the density of vibrational states. We have suggested longitudinal low-energy modes in the spectra that might be responsible for the Δr(i) dependence of λ.

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Thermal conductivity of the charge-density-wave systemsK0.3MoO3

Cited by 67 publications

References 18 publications

Thermal and electrical transport in the spin density wave antiferromagnet CaFe4As3

Thermal and electrical transport in the spin density wave antiferromagnet CaFe4As3

Magnetic, thermal, and electrical properties of an Ni45.37Mn40.91In13.72 Heusler alloy

Correlation between thermal conductivity and bond length alternation in carbon nanotubes: A combined reverse nonequilibrium molecular dynamics—Crystal orbital analysis

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