Thermal conductivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>in the superconducting state

Putti, M.; Braccini, V.; d’Agliano, E. Galleani; Napoli, Francesco; Pallecchi, I.; Siri, A. S.; Manfrinetti, P.; Palenzona, A.

doi:10.1103/physrevb.67.064505

Cited by 36 publications

(50 citation statements)

References 15 publications

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“…The superconducting transition temperature (T c ) is defined at temperatures where ρ → 0. For very phase pure polycrystalline MgB 2 , the ρ 300K value in literature is reported around10-100µΩ-cm [5,33,[38][39][40]. In fact in polycrystalline samples, the connectivity of grains affects the conduction in a major way [29].…”

Section: Kmentioning

confidence: 99%

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Physical property characterization of bulk MgB2 superconductor

et al. 2008

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Section: Kmentioning

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“…Rowell, showed that outside grains impurities/porous regions are mainly responsible for the widely varying conductivity of the MgB 2 superconductor [29]. For most of studied bulk polycrystalline samples [35,[38][39][40] along with the present one, the problem of connectivity is more serious, than better-connected most of MgB 2 thin films [29].…”

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confidence: 99%

Physical property characterization of bulk MgB2 superconductor

et al. 2008

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“…Actually, also phonons carry heat and only if their contribution is negligible reliable analysis can be carried out. We demonstrated that in very clean MgB 2 samples the phonon contribution can be neglected; 15 on the other hand, in large single crystals they give detectable contributions. 19 Under the hypothesis of a negligible phonon contribution, the thermal conductivity in the superconducting state can be written as the sum of the π and σ thermal conductivities: we can still try to analyze them in a clean limit framework.…”

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“…15 We selected five well characterized samples. They were prepared by direct synthesis from crystalline elements.…”

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Critical field ofMgB2: Crossover from clean to dirty regimes

et al. 2004

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We have studied the upper critical field, B c2 , in poly-crystalline MgB 2 samples in which disorder was varied in a controlled way to carry selectively π and σ bands from clean to dirty limit. We have found that the clean regime survives when π bands are dirty and σ bands are midway between clean and dirty. In this framework we can explain the anomalous behaviour of Al doped samples, in which B c2 decreases as doping increases.The two gap superconductivity, studied since the fifties, has found a very nice paradigm in MgB 2 which shows two well separated gaps associated with the two band sets which cross the Fermi level.The larger gap ∆ σ (≈7 meV) is related to the two-dimensional p-type σ bands, strongly coupled with optical boron modes, whereas the smaller gap ∆ π (≈2 meV) is related with the three-dimensional π bands.1,2 π and σ bands have nearly equal density of states, so that both contribute significantly to the physical properties.The upper critical field B c2 was one of the first properties that emphasized the existence of two 6-8

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“…10,11,12,13 In previous work it was demonstrated that important aspects of multigap superconductivity in MgB 2 can experimentally be addressed by measurements of the thermal conductivity κ as a function of temperature T and external magnetic field H. 14,15,16,17,18,19,20 Particularly useful are κ(H) data in the mixed state, 19 because they allow for distinguishing between the contributions of the different bands to the electronic heat transport and the scattering of phonons by electrons. Accompanying theoretical considerations 21,22,23,24 support these interpretations.…”

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Influence of carbon substitution on the heat transport in single crystallineMgB2

et al. 2005

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We report data on the thermal conductivity κ(T, H) in the basal plane of hexagonal singlecrystalline and superconducting Mg(B1−xCx)2 (x = 0.03, 0.06) at temperatures between 0.5 and 50 K, and in external magnetic fields H between 0 and 50 kOe. The substitution of carbon for boron leads to a considerable reduction of the electronic heat transport, while the phonon thermal conductivity seems to be much less sensitive to impurities. The introduction of carbon enhances mostly the intraband scattering in the σ-band. In contrast to the previously observed anomalous behavior of pure MgB2, the Wiedemann-Franz law is valid for Mg(B0.94C0.06)2 at low temperatures.

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Thermal conductivity ofMgB2in the superconducting state

Cited by 36 publications

References 15 publications

Physical property characterization of bulk MgB2 superconductor

Physical property characterization of bulk MgB2 superconductor

Critical field ofMgB2: Crossover from clean to dirty regimes

Influence of carbon substitution on the heat transport in single crystallineMgB2

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