engleski

Glass transition from a slush to a real glass in charge-density-wave compound TaS_3

We have found by broad-band dielectric spectroscopy of charge density wave (CDW) compound TaS_3 that the main relaxation time representing CDW viscosity shows a critical slowing down in the range 55-50 K. At lower temperatures two additional processes appear that we assign to the defects in CDW superlattice. Based on very strong similarity with the glass transition in supercooled liquids, we propose a consistent scenario of the glass transition from a CDW slush to a real CDW glass. The length/time scales involved imply the existence of a new family of glasses in systems with the long-range order such as CDW.

charge-density-wave systems; glass transitions; exchange; correlation; dielectric and magnetic functions; plasmons; dielectric permittivity; dielectric loss and relaxation

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