1.
Phys Rev Lett
; 88(25 Pt 1): 255901, 2002 Jun 24.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12097101
RESUMO
We present low-temperature measurements, between 20 mK and 20 K, of the sound velocity variations in a single grain of the decagonal quasicrystal Al-Ni-Co. We have used acoustic shear waves of frequency 70 MHz propagating in the quasicrystalline planes with two different polarizations: parallel and perpendicular to the quasicrystalline planes. Our results show the presence of tunneling states (TSs) with a strong difference of the phonon-TS coupling for the two polarizations, which reveals a strong anisotropy of distribution of the orientations of the TSs in the sample. This result gives direct evidence that TSs are generated by the quasicrystalline structure itself.
2.
3.
4.
5.
Acoustic study of tunneling states in Kramers-ion-doped glasses: Wave propagation and phonon echoes.
Phys Rev B Condens Matter
; 48(17): 12842-12852, 1993 Nov 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-10007657
6.
Phys Rev B Condens Matter
; 32(8): 5481-5482, 1985 Oct 15.
Artigo
em Inglês
| MEDLINE
| ID: mdl-9937778