Abstract
Two types of surface structures were observed at ∼280 K by scanning tunneling microscopy on a crystal surface of β-(BEDT-TTF)2PF6. One is a structure which corresponds to the expected crystal structure determined by X-ray diffraction measurement, and the other is a modulated structure with two-fold periodicity perpendicular to the one-dimensional conductive axis. Fluctuation between these two types of structures in the same area was observed by scanning tunneling microscopy, with a surface defect used as a positional marker. Occurrence of a double tip effect was considered but concluded not to be responsible for the observed change.
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