A stripe pattern with a spacing of a few micrometers is observed to show up on the crystal surface of a potassium 7,7′,8,8′- tetracyanoquinodimethane (K-TCNQ) upon the current-induced local insulator-metal transition. The spatially resolved reflectivity and Raman spectroscopies have shown that the stripe is a consequence of periodic phase separation with alternate dimerized and less-dimerized domains in the TCNQ stacks. The periodic modulation of the electronic state is generated in order to minimize the energy of the lattice strain, arising from the current-induced relaxation of the Peierls distortion.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2004 Sep|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics