Spatially resolved tunneling spectroscopy on TTF-TCNQ

Z. Z. Wang, J. C. Girard, C. Pasquier, D. Jérome
2004 Journal de Physique IV : Proceedings  
Local tunneling spectroscopy has been measured with low temperature UHV-STM on in-situ cleaved ab surface of organic TTF-TCNQ crystal. Due to ultra low image drift and clear molecular resolution, the spectroscopy is performed at specific molecular site either on TCNQ or TTF chains. In normal state (T= 63 K), a large pseudo-gap exists both in TTF and TCNQ chains. Above pseudo-gap local density of states differs for TTF and TCNQ chains that is in good agreement with double band model. By the
more » ... ture of an anomalous in local spectroscopy measurement, a single impurity has been detected on a TTF chain. Charge density wave fluctuation is pinned by impurity above critical temperature (T=54K). Results obtained show that, Scanning Tunneling Spectroscopy can provide spatially resolved spectroscopic information at nanometer scale.
doi:10.1051/jp4:2004114017 fatcat:fkanr2ejtrat3dz4e6dv26lzca