Low-temperature transport, thermal, and optical properties of single-grain quasicrystals of icosahedral phases in the Y-Mg-Zn and Tb-Mg-Zn alloy systems (Articolo in rivista)

Type
Label
  • Low-temperature transport, thermal, and optical properties of single-grain quasicrystals of icosahedral phases in the Y-Mg-Zn and Tb-Mg-Zn alloy systems (Articolo in rivista) (literal)
Anno
  • 2000-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.62.262 (literal)
Alternative label
  • M. A. Chernikov, S. Paschen, E. Felder, P. Vorburger, B. Ruzicka, L. Degiorgi, and H. R. Ott I. R. Fisher and P. C. Canfield (2000)
    Low-temperature transport, thermal, and optical properties of single-grain quasicrystals of icosahedral phases in the Y-Mg-Zn and Tb-Mg-Zn alloy systems
    in Physical review. B, Condensed matter
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. A. Chernikov, S. Paschen, E. Felder, P. Vorburger, B. Ruzicka, L. Degiorgi, and H. R. Ott I. R. Fisher and P. C. Canfield (literal)
Pagina inizio
  • 262 (literal)
Pagina fine
  • 272 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 62 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Laboratorium fur Festkorperphysik, Eidgenossische Technische Hochschule-Zurich, 8093 Zurich, Switzerland Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (literal)
Titolo
  • Low-temperature transport, thermal, and optical properties of single-grain quasicrystals of icosahedral phases in the Y-Mg-Zn and Tb-Mg-Zn alloy systems (literal)
Abstract
  • We present a comprehensive series of results of electrical transport (electrical conductivity, magnetoconductivity, Hall effect), thermal (specific heat), and optical (reflectivity) measurements in varying temperature ranges between 1.5 and 300 K on high-quality single-grain quasicrystals of icosahedral Y-Mg-Zn. This data set is augmented by the specific-heat and optical-reflectivity data obtained from a single-grain quasicrystal of icosahedral Tb-Mg-Zn. For Y-Mg-Zn, both the electrical conductivity sigma(T) and magnetoconductivity delta sigma(H) may be described by calculations considering quantum interference effects. A detailed comparison of the weak-localization contributions to sigma(T) and delta sigma(H) with our experimental data provides estimates of the inelastic and spin-orbit relaxation rates. The inelastic relaxation rate is found to be proportional to T-3. The dominant contributions to the optical conductivity sigma(1)(omega) spectrum, obtained from the reflectivity R(omega) data in the frequency range between 16 and 9.7 X 10(4) cm(-1), are a strong Drude feature at low frequencies and a prominent absorption signal centered at approximately 6 X 10(3) cm(-1). A comparison of the spectral weight of the Drude contribution to sigma(1)(omega) with the magnitude of the linear-in-ir term gamma T of the low-temperature specific heat C-p(T) yields the itinerant charge-carrier density n(i) = 7.62 X 10(21) cm(-3) or 0.13 charge carriers per atom. The low ni value is corroborated by the results of the Hall effect measurements. For Tb-Mg-Zn, the optical conductivity sigma(1)(omega) spectrum reveals features similar to those of Y-Mg-Zn. The low-temperature specific heat C-P(T) of Tb-Mg-Zn is strongly influenced by a spin-glass-type freezing of Tb moments and by crystal-electric-field effects. (literal)
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