A mu SR study of the CDW in TTF-TCNQ

The muon spin rotation (mu SR) technique is primarily a powerful probe of t he magnetic properties of materials; but it is also possible to measure cha rge-density related effects using muon quadrupolar level crossing resonance (QLCR). We present the first study of a charge density wave (CDW) using mu SR in TTF-TCNQ. The CDW develops below the metal-insulator transition at 5 4 K and we study the evolution of the CDW as a function of temperature usin g the QLCR resonances of the nitrogen atoms on the TCNQ molecules as the pr obe.