J. Phys. IV France 09 (1999) Pr10-379-Pr10-381
Ring-shaped crystals of NbSe3 and TaSe3S. Tanda, H. Kawamoto, M. Shiobara, Y. Okajima and K. Yamaya
Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan
We discover new ring- and tube-shaped crystals of NbSe3, and find a reproducibly synthesizing condition for TaSe3 beautiful rings, as well as NbSe3. We confirm that the ring is a single-phase NbSe3 crystal from the X-ray diffraction, and that a charge-density wave (CDW) transition takes place near 140 K by observing satellites of electron diffraction peaks. The position of the satellites coincides with that of the conventional NbSe3 at the CDW transition. The non-linear conduction due to the CDW sliding is also observed in the ring crystals. The threshold field is similar to the conventional ribbon-shaped NbSe3 crystals. These results give the first evidences of existence of a CDW-ring.
© EDP Sciences 1999