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Dielectric constant of glasses: first observation of a two-dimensional behavior | | F. Ladieu
; J. Le Cochec
; P. Pari
; P. Trouslard
; P. Ailloud
; | | Date: |
1 Oct 2002 | | Journal: | Phys. Rev. Lett. 90, 205501 (2003) | | Subject: | cond-mat | | Affiliation: | CEA/Saclay, Drecam/LPS, France), J. Le Cochec (CEA/Saclay, Drecam/LPS, France), P. Pari (CEA/Saclay, Drecam/Spec, France), P. Trouslard (INSTN/LVDG, Cea/Saclay, France), P. Ailloud (CEA/Saclay, Drecam/LPS, France | | Abstract: | The 1kHz real part $chi’$ of the dielectric constant of a structural glass was measured at low temperature $T$ down to 14 mK. Reducing the sample thickness $h$ to 10 nm suppresses the usual minimum of $chi’$ for measuring fields $E<.5 $ MV/m. This contradicts the Two Level System (TLS) model but is well accounted for by including TLS-TLS interactions where excitations delocalize between TLS’s through a $E$-induced mechanism recently designed: for small $h$’s this interaction is reduced, which explains the two-dimensional behavior of $chi’(T)$. Hence, interactions play a key role in standard thick samples. | | Source: | arXiv, cond-mat/0210024 | | Services: | Forum | Review | PDF | Favorites | |
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