Tunneling states in mineral crystals
Laboratoire de Physique des Solides - Université Paris-Sud
Bât. 510, 91405 Orsay, France
Accepted: 18 October 2000
We report on an acoustic study at low temperature of two natural mineral crystals (olivine and cordierite). These samples are single crystals of very good quality and have in their unit cells 28 atoms and 116 atoms, respectively. We have observed the specific acoustic properties expected from tunneling states (TSs): logarithmic velocity variation and phonon echoes. These results suggest that TSs are intrinsic in crystals with a large number of atoms in the unit cell.
PACS: 66.35.+a – Quantum tunneling of defects / 63.20.Pw – Localized modes / 62.65.+k – Acoustical properties of solids
© EDP Sciences, 2000