Pregled bibliografske jedinice broj: 46881
Thermal conductivity of (Ta1-xNbxSe4)2I alloys
Thermal conductivity of (Ta1-xNbxSe4)2I alloys // Proceedings of the Twenty-fourth International Thermal Conductivity Conference and Proceedings of the Twelfth International Thermal Expansion Symposium / Gaal, Peter S. ; Apostolescu, Daniela E. (ur.).
Lancaster: Technomic, 1999. str. 173-182 (pozvano predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
Thermal conductivity of (Ta1-xNbxSe4)2I alloys
Autori
Smontara, Ana ; Lasjaunias, Jean, Claude ; Maynard, Roger ; Bilušić, Ante
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings of the Twenty-fourth International Thermal Conductivity Conference and Proceedings of the Twelfth International Thermal Expansion Symposium
/ Gaal, Peter S. ; Apostolescu, Daniela E. - Lancaster : Technomic, 1999, 173-182
ISBN
1-56676-711-3
Skup
International Thermal Conductivity Conference (24 ; 1999) ; International Thermal Expansion Symposium (12 ; 1999)
Mjesto i datum
Pittsburgh (PA), Sjedinjene Američke Države, 26.10.1997. - 29.10.1997
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
lattice thermal conductivtiy; lattice anharmonicity; quasi-one dimensional semiconductors
Sažetak
We present measurements and analysis of the phonon thermal conductivity k(T) of the alloys of the linear-chain compounds (TaSe4)2I and (Ta0.99Nb0.01Se4)2I, in the temperature range 60mK-6K. k(T) shows a very sharp peak in the vicinity of 1K and 2K for a (TaSe4)2I and (Ta0.99Nb0.01Se4)2I, respectively. The appearance of the peak in these systems is explained by a Poiseuille flow of phonons, originating from their strong anharmonicity amplified by the lattice anisotropy. k(T) of (TaSe4)2I obeys cubic variation (kľT3) below 0.8K, in good agreement with the boundary scattering regime. While k(T) of (Ta0.99Nb0.01Se4)2I and (TaSe4)2I (remeasured after a long storage at room temperature, and several thermal cycles down to 4K) in the temperature range 0.1K-1K and 60mK-6K, respectively, obeys quasi-quadratic regime (kľT1.8). This is ascribed to extended "linear or planar defects" specific to this very anisotropic structure, introduced either by doping Nb atoms in (TaSe4)2I or by successive thermal cycling. Below 0.1K, k(T) of (Ta0.99Nb0.01Se4)2I follows a cubic variation in good agreement with the boundary scattering regime.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Napomena
Predavač dr. sc. Ana Smontara.
