Superconducting fluctuations in the thermal conductivity of and materials

Houssa, Michel; Ausloos, Marcel; Cloots, Rudi; Bougrine, Hassan

doi:10.1103/PhysRevB.56.802

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Superconducting fluctuations in the thermal conductivity of and materials

Houssa, Michel; Ausloos, Marcel; Cloots, Rudi et al.

1997 • In Physical Review. B, Condensed Matter and Materials Physics, 56 (2), p. 802 - 808

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https://hdl.handle.net/2268/336196

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10.1103/PhysRevB.56.802

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Abstract :

[en] The thermal conductivity κ of (Formula presented) and (Formula presented) polycrystals is analyzed near the critical temperature ((Formula presented) and 83.8 K, respectively) in order to extract the superconducting fluctuation contribution (Formula presented) The fluctuationless background is calculated in a formal way, taking into account both an electronic and a phonon contribution above and below the critical temperature. The fluctuation contribution to the electronic thermal conductivity is then extracted. A crossover from a critical to a Gaussian fluctuation regime (Formula presented) is observed on the (Formula presented) sample both above and below (Formula presented) followed by a crossover from a three-dimensional (3D) to a 2D Gaussian behavior (Formula presented) as the sample temperature is further moved away from (Formula presented) On the other hand, a 3D behavior only is observed on the (Formula presented) material in the normal and superconducting states. In both systems, the critical exponents are found to be those theoretically predicted. Moreover, the crossover temperatures are consistent with those expected from the differently anisotropic structures of these compounds. From the crossover temperatures and the thermal conductivity fluctuation contribution amplitudes, quite realistic values for the Ginzburg-Landau parameter (Formula presented) the interlayer coupling energy (Formula presented) and the electronic mean free path (Formula presented) near (Formula presented) are found in those materials. © 1997 The American Physical Society.

Disciplines :

Physics
Chemistry

Author, co-author :

Houssa, Michel ; Université de Liège - ULiège > Département de physique > S.U.P.R.A.S.

Ausloos, Marcel ; Université de Liège - ULiège > Département de physique > S.U.P.R.A.S.

Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie générale et chimie physique

Bougrine, Hassan ; Université de Liège - ULiège > Département de physique > S.U.P.R.A.S.

Language :

English

Title :

Superconducting fluctuations in the thermal conductivity of and materials

Publication date :

1997

Journal title :

Physical Review. B, Condensed Matter and Materials Physics

ISSN :

1098-0121

eISSN :

1550-235X

Publisher :

American Physical Society, United States - Maryland

Volume :

Issue :

Pages :

802 - 808

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 23 September 2025

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