Thermal conductivity of polycrystalline YBa2Cu4O8

Andersson, Britt M.Umeå universitet,Institutionen för fysik,Umeå university (author)

Godkänd; 1994; 20080426 (ysko)
We have measured the thermal conductivity κ and the thermal diffusivity a of a dense bulk ceramic polycrystalline sample of YBa2Cu4O8 (1:2:4) in the temperature range 30–300 K. We find κ≊10 W m-1 K-1 at 100 K, significantly higher than in ceramic YBa2Cu3O7-δ (1:2:3) and approaching the in-plane value for single-crystal 1:2:3, and decreasing to 7.6 W m-1 K-1 at 300 K. The data for this sample can be described by standard theories for phonon thermal conductivity of crystalline materials with boundary, phonon, and electron scattering. The higher κ in 1:2:4 as compared to 1:2:3 is, in this model, due to the smaller point defect scattering in the former. The fitted parameters for the three scattering mechanisms all agree with independent estimates based on simple models; inserting data for electric resistivity, grain size, carrier density, and lattice properties we can predict κ and its T dependence to within about 20%. We also discuss models for the phonon and electron thermal conductivities in some detail, including some second-order effects such as inelastic electron scattering and a T-dependent carrier density.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
Thermal conductivity
superconductor
ceramic
high transition temperature
electronic conduction
lattice conduction
electron-phonon interaction
phonon-phonon interaction
YBa2Cu4O8
Condensed matter physics
Kondenserade materiens fysik
fysik
Physics
Materialteknik

Sundqvist, BertilUmeå universitet,Institutionen för fysik,Umeå university(Swepub:umu)besu0001 (author)
Niska, JohnLuleå tekniska universitet (author)
Loberg, Bengt (author)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

In:Physical Review B. Condensed Matter and Materials Physics49:6, s. 4189-41981098-01211550-235X
In:Physical Review B Condensed Matter49:6, s. 4189-41980163-18291095-3795

By the author/editor: Andersson, Britt ...; Sundqvist, Berti ...; Niska, John; Loberg, Bengt

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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