Naslov
Extrinsic origin of the insulating behavior of polygrain icosahedral Al-Pd-Re quasicrystals

Autori
Dolinšek, J. ; McGuiness, P.J. ; Klanjšek, M. ; Smiljanić, Igor ; Smontara, Ana ; Zijlstra, E.S. ; Bose, S. K. ; Fisher, I.R. ; Kramer, M.J. ; Canfield, P. C.

Izvornik
Physical Review B (1098-0121) 74 (2006), 13; 134201-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Al-based quasicrystals; electronic transport properties; variable-range hopping conductivity; porous structure

Sažetak
Polygrain icosahedral i-Al-Pd-Re quasicrystals are known to exhibit dramatically different electronic transport properties to other Al-based quasicrystals. By performing comparative experimental and theoretical studies of the electronic transport and electronic structure of polygrain and monocrystalline i-Al-Pd-Re samples, we show that the extraordinarily high electrical resistivity and the metal-to-insulator transition in the polygrain material are not intrinsic properties of the quasiperiodic lattice, but are of extrinsic origin due to the high porosity and the oxygen-rich weakly insulating regions in the material. We also compare theoretical electronic structures and experimental electrical resistivities of monocrystalline i-Al-Pd-Re and i-Al-Pd-Mn quasicrystals and show that there are no significant differences between these two isomorphous compounds, suggesting that i-Al-Pd-Re is on common ground with other Al-based quasicrystals. We present a structural model of i-Al-Pd-Re.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA