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Thermal conductivity and electrical resistivity of gadolinium as functions of pressure and temperatur
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1989 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 40, no 14, 9541-9551 p.Article in journal (Refereed) Published
Abstract [en]

The electrical resistivity ρ and the thermal diffusivity a of gadolinium have been measured as functions of T in the range 45–400 K. The thermal conductivity λ has been calculated from a and experimental data for the specific-heat capacity, cp. λ can be analyzed in terms of simple models for the lattice and electronic components above the Curie temperature TC≃291.4 K. Below TC an additional term, identified as a magnon (spin-wave) thermal conductivity λm, is found. ρ and λ have also been studied as functions of T and P in the range 150–400 K and 0–2.5 GPa. The Lorenz function L=ρλ/T increases by about 20%/GPa under pressure due to a very strong pressure dependence of the lattice thermal conductivity. The pressure coefficients of ρ and λ are -5.1×10-2 and 0.22 GPa-1, respectively, at 300 K (above TC), and 0 and 0.16 GPa-1 at 200 K (below TC). TC and the spin-reorganization temperature Tr≃219 K both decrease under pressure, at the rates -14.0 and -22.0 K/GPa, respectively. Although the magnitude of λm cannot be accurately calculated from the zero-pressure data for λ, the temperature dependence of dλ/dP allows us to distinguish between several models and assign a value of λm≃1.5 W m-1 K-1, or 16.0% of λ, at 200 K.

Place, publisher, year, edition, pages
1989. Vol. 40, no 14, 9541-9551 p.
Keyword [en]
Thermal conductivity, thermal diffusivity, specific heat capacity, electrical resistivity, conductivity, Lorenz function, high pressure, spin scattering, spin wave transport, magnons, Curie temperature, phonon thermal conductivity, lattice thermal conductivity
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26703DOI: 10.1103/PhysRevB.40.9541OAI: diva2:273562
Available from: 2009-10-22 Created: 2009-10-22 Last updated: 2009-12-11

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