Linear thermal expansivity (1–300 K), specific heat (1–108 K), and electrical resistivity of the icosahedral quasicrystal i-Al61.4Cu25.4Fe13.2

Linear thermal expansivity (α, 1–300 K), heat capacity (Cp, 1–108 K), and electrical resistivity (ρ, 1–300 K) measurements are reported for single grain i-Al61.4Cu25.4Fe13.2 quasicrystals as a function of sample processing. While ρ(T) is sensitive to sample treatment, both Cp and α are relatively insensitive (to a few percent) except at the lowest temperatures (below 4 K), where an inverse correlation between ρ and the electronic Cp coefficient γ appears to exist. Dispersion effects (deviations from Debye-like behavior) in both Cp and the lattice Grüneisen parameter Γ are large and comparable with those for single grain iAl71Pd21Mn08quasicrystal and its Al72Pd25Mn03 approximant [Phys. Rev. B 65, 184206 (2002)]. Since the 0-K Debye temperature [Θ0=536(2)K] is in reasonable agreement with that from 4-K elastic constants [548(8) K], a previous postulate for AlPdMn that these large dispersion effects are associated with high dispersion lattice modes in off-symmetry directions also appears to apply to i-Al-Cu-Fe. A comparison with other Cp data suggests that the major effects of sample treatment (and composition) are reflected, with a few exceptions, in the values of γ, with remarkably similar lattice contributions. Disciplines Condensed Matter Physics | Metallurgy Comments This article is from Physical Review B 66 (2002): 184206, doi:10.1103/PhysRevB.66.184206. This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ameslab_pubs/112 Linear thermal expansivity „1–300 K..., specific heat „1–108 K..., and electrical resistivity of the icosahedral quasicrystal i-Al61.4Cu25.4Fe13.2 C. A. Swenson,* T. A. Lograsso, A. R. Ross, and N. E. Anderson, Jr. Ames Laboratory, Iowa State University, Ames, Iowa 50011 ~Received 27 June 2002; revised manuscript received 3 September 2002; published 18 November 2002! Linear thermal expansivity (a , 1–300 K!, heat capacity (Cp , 1–108 K!, and electrical resistivity (r , 1–300 K! measurements are reported for single grain i-Al61.4Cu25.4Fe13.2 quasicrystals as a function of sample processing. While r(T) is sensitive to sample treatment, both Cp and a are relatively insensitive ~to a few percent! except at the lowest temperatures ~below 4 K!, where an inverse correlation between r and the electronic Cp coefficient g appears to exist. Dispersion effects ~deviations from Debye-like behavior! in both Cp and the lattice Grüneisen parameter G are large and comparable with those for single grain i-Al71Pd21Mn08 quasicrystal and its Al72Pd25Mn03 approximant @Phys. Rev. B 65, 184206 ~2002!#. Since the 0-K Debye temperature @Q0 5536(2) K# is in reasonable agreement with that from 4-K elastic constants @548~8! K#, a previous postulate for AlPdMn that these large dispersion effects are associated with high dispersion lattice modes in offsymmetry directions also appears to apply to i-Al-Cu-Fe. A comparison with other Cp data suggests that the major effects of sample treatment ~and composition! are reflected, with a few exceptions, in the values of g , with remarkably similar lattice contributions. DOI: 10.1103/PhysRevB.66.184206 PACS number~s!: 61.44.Br, 62.20.Dc, 65.40.Ba, 65.40.De