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Magnetic field effect on the dielectric constant of glasses: Evidence of disorder within tunneling barriers | | J. Le Cochec
; F. Ladieu
; P. Pari
; | | Date: |
27 Mar 2002 | | Journal: | Phys. Rev. B 66, 064203 (2002) | | Subject: | cond-mat | | Affiliation: | CEA/Saclay, Drecam/LPS, France), F. Ladieu (CEA/Saclay, Drecam/LPS, France), P. Pari (CEA/Saclay, Drecam/Spec, France | | Abstract: | The magnetic field dependence of the low frequency dielectric constant $e_r$(H) of a structural glass a - SiO2 + xCyHz was studied from 400 mK to 50 mK and for H up to 3T. Measurement of both the real and the imaginary parts of $e_r$ is used to eliminate the difficult question of keeping constant the temperature of the sample while increasing H: a non-zero $e_r$(H) dependence is reported in the same range as that one very recently reported on multicomponent glasses. In addition to the recently proposed explanation based on interactions, the reported $e_r$(H) is interpreted quantitatively as a consequence of the disorder lying within the nanometric barriers of the elementary tunneling systems of the glass. | | Source: | arXiv, cond-mat/0203564 | | Services: | Forum | Review | PDF | Favorites | |
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