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

Article

关键词: AL-CU-FE;    DENSITY-OF-STATES;    INELASTIC NEUTRON-SCATTERING;    ALCUFE QUASI-CRYSTALS;    METAL-INSULATOR-TRANSITION;    TEMPERATURE SPECIFIC-HEAT;    HIGH STRUCTURAL QUALITY;    ELECTRONIC-PROPERTIES;    SINGLE GRAINS;    LI-CU;   

DOI  :  10.1103/PhysRevB.66.184206

来源: SCIE

【 摘 要 】

Linear thermal expansivity (alpha, 1-300 K), heat capacity (C-p, 1-108 K), and electrical resistivity (rho, 1-300 K) measurements are reported for single grain i-Al61.4Cu25.4Fe13.2 quasicrystals as a function of sample processing. While rho(T) is sensitive to sample treatment, both C-p and alpha are relatively insensitive (to a few percent) except at the lowest temperatures (below 4 K), where an inverse correlation between rho and the electronic C-p coefficient gamma appears to exist. Dispersion effects (deviations from Debye-like behavior) in both C-p and the lattice Gruneisen parameter Gamma 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 [Theta(0)=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 C-p data suggests that the major effects of sample treatment (and composition) are reflected, with a few exceptions, in the values of gamma, with remarkably similar lattice contributions.

【 授权许可】

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