The dynamics around the glass transition in the spin density wave ground state of TMTSF2PF6

Abstract
We present experimental observations of the dielectric and energy relaxations in the spin density wave state of TMTSF2PF6. These measurements reveal two distinct dynamical regimes. The dielectric relaxation shows a critical slowing down towards a 'static' glass transition around 2 K. Below this temperature very slow energy relaxation processes appear, which exhibit breaking of ergodicity associated with aging effects. These results are analysed within the framework of glass-forming systems.