Analysis of in-plane thermal conductivity anomalies in YBa2Cu3O7  cuprate superconductors

Varshney, Dinesh; Choudhary, K. K.; Singh, Rajendra

doi:10.1088/1367-2630/5/1/372

Cited by 26 publications

(9 citation statements)

References 29 publications

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“…At the same time it is wise to note that at fairly low temperatures the Widemann-Franz law often breaks down severely and the metallic behaviour of solids which become superconducting suggests that the electronic thermal conductivity starts to disappear κ e → 0 leaving only the lattice thermal conductivity κ l as dominating quantity. [52][53][54][55] Owing to this concept we have taken κ e negligibly small and thus κ = κ l + κ e ≈ κ l instead of the concept of isolated channels. 26 The contribution due to electron-phonon interactions is considered via linewidth of electrons and phonons method in the thermal conductivity expression 29…”

Section: Thermal Conductivity Of High Temperature Superconductorsmentioning

confidence: 99%

Signature of electron-phonon interaction in high temperature superconductors

Ashokan

Indu

Dimri³

2011

AIP Advances

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The theory of thermal conductivity of high temperature superconductors (HTS) based on electron and phonon line width (life times) formulation is developed with Quantum dynamical approach of Green's function. The frequency line width is observed as an extremely sensitive quantity in the transport phenomena of HTS as a collection of large number of scattering processes. The role of resonance scattering and electron-phonon interaction processes is found to be most prominent near critical temperature. The theory successfully explains the spectacular behaviour of high Tc superconductors in the vicinity of transition temperature. A successful agreement between theory and experiment has been obtained by analyzing the thermal conductivity data for the sample La1.8Sr0.2CuO4 in the temperature range 0 − 200K. The theory is equally and successfully applicable to all other high Tc superconductors

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Section: Thermal Conductivity Of High Temperature Superconductorsmentioning

confidence: 99%

Signature of electron-phonon interaction in high temperature superconductors

Ashokan

Indu

Dimri³

2011

AIP Advances

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“…As the simplest approximation to the problem at hand, the isotropic Debye model approach is used to derive qualitative results, as we will demonstrate later. We start with a model Hamiltonian that follows [12,13]…”

Section: Resultsmentioning

confidence: 99%

Effect of Ca(Ce) doping on thermopower of LaMnO3 manganites

Varshney

Mansuri

Yogi

2010

Low Temperature Physics

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With a view to explain the thermoelectric effects of La 0.8 Ca 0.2 MnO 3 and La 0.8 Ce 0.2 MnO 3 polycrystalline samples and to seek the role of scattering mechanism, a systematic investigation of thermopower S(T) in the metallic phase have been undertaken. Within the relaxation time approximation, it is noticed that, the phonon drag S(T) with scattering of phonons from defects, grain boundaries, phonons and charge carriers in these samples are effective in the metallic regime. Later on, Mott expression is employed to incorporate the carrier diffusive thermopower. The temperature dependence of the S(T) is determined by competition among the several operating scattering mechanisms for the heat carriers and a balance between carrier diffusion and phonon drag contributions in the polycrystalline samples of La 0.8 Ca 0.2 MnO 3 and La 0.8 Ce 0.2 MnO 3 .

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“…The use of the Debye model is reasonable in manganites and cuprates since the temperature region of interest lies well below the Debye temperature [9][10][11][12][13][14]. As the simplest approximation to the problem at hand, the isotropic Debye model approach is used to derive qualitative results, as we will demonstrate later.…”

Section: Modelmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Role of phonon drag and carrier diffusion in thermoelectric power of polycrystalline La0.97Na0.03MnO3 manganites

Varshney

Choudhary

2014

J Adv Ceram

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Abstract:We develop a theoretical model for quantitative analysis of temperature-dependent thermoelectric power of monovalent (Na) doped La 0.97 Na 0.03 MnO 3 manganites. In the ferromagnetic regime, we have evaluated the phonon thermoelectric power by incorporating the scattering of phonons with impurities, grain boundaries, charge carriers and phonons. In doing so, we use the Mott expression to compute the carrier (hole) diffusion thermoelectric power (

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Analysis of in-plane thermal conductivity anomalies in YBa₂Cu₃O₇cuprate superconductors

Cited by 26 publications

References 29 publications

Signature of electron-phonon interaction in high temperature superconductors

Signature of electron-phonon interaction in high temperature superconductors

Effect of Ca(Ce) doping on thermopower of LaMnO3 manganites

Role of phonon drag and carrier diffusion in thermoelectric power of polycrystalline La0.97Na0.03MnO3 manganites

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