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Pregled bibliografske jedinice broj: 38102

Low-temperature thermal conductivity of icosahedral Al63Cu25Fe12 and Al62Cu25.5Fe12.5 quasicrystals


Smontara, Ana; Lasjaunias, Jean-Claude; Paulsen, Carley; Bilušić, Ante; Calvayrac, Yvonne
Low-temperature thermal conductivity of icosahedral Al63Cu25Fe12 and Al62Cu25.5Fe12.5 quasicrystals // Materials science and engineering A : structural materials properties, microstructure and processing, 294/296 (2000), (S.I.); 706-710 doi:10.1016/S0921-5093(00)01050-9 (podatak o recenziji nije dostupan, konferencijsko priopćenje, znanstveni)


Naslov
Low-temperature thermal conductivity of icosahedral Al63Cu25Fe12 and Al62Cu25.5Fe12.5 quasicrystals

Autori
Smontara, Ana ; Lasjaunias, Jean-Claude ; Paulsen, Carley ; Bilušić, Ante ; Calvayrac, Yvonne

Izvornik
Materials science and engineering A : structural materials properties, microstructure and processing (0921-5093) 294/296 (2000), (S.I.); 706-710

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, konferencijsko priopćenje, znanstveni

Ključne riječi
Low-T phonon thermal conductivity

Sažetak
We present measurements of thermal and electrical conductivity of icosahedral Al63Cu25Fe12 and Al62Cu25.5Fe12.5 quasicrystals in the temperature range 0.1 K-6 K. Electrical conductivity Ds(T)=s(T)-s(4.2 K) of Al63Cu25Fe12, contrary to Ds(T) of Al62Cu25.5Fe12.5, shows a linear increase with up to 2 K, as predicted by electron-electron interaction theories, followed by a strong change of regime at around 2 K. Low-temperature phonon thermal conductivity, kph(T), of Al63Cu25Fe12 shows a deviation from the expected T3 cubic law: in the T-range 0.1 K-0.8 K, kph(T)~T2.7. An anomaly in phonon thermal conductivity appears near 1 K, which superposes to the monotonous increase of kph(T) with T obeyed up to higher T. We suppose that the origin of this anomaly in phonon thermal conductivity is related to the strong change of the regime in the variation of the Ds(T), which appears in the same temperature range. For Al62Cu25.5Fe12.5, kph(T) varies almost linearly between 0.28 and 1.2 K, and exhibits a crossover towards a very rapid variation below 150 mK, much more rapid than T3. There is no evidence for phase transitions from specific heat measurements in the temperature range of the crossover of k(T).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je kao poster prezentiran na skupu 7th International conference on quasicrystals (ICQ7), održanom od 20.-24.09.1999., Stuttgart, Njemačka ; objavljen u Zborniku radova.



POVEZANOST RADA


Projekt / tema
00350107

Ustanove
Institut za fiziku, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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