X-Ray Study of the Density Wave Instability of alpha-(BEDT-TTF)2MHg(SCN)4 with M=K and Rb

Details X-Ray Study of the Density Wave Instability of alpha-(BEDT-TTF)2MHg(SCN)4 with M=K and Rb X-Ray Study of the Density Wave Instability of alpha-(BEDT-TTF)2MHg(SCN)4 with M=K and Rb

2003-03-03

arxiv.org/abs/cond-mat/0303023v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures to be published in Synthetic Metals 2003

Scientific paper

We present an X-ray diffraction study of the quasi-2D conductors a-(BEDTTTF)2MHg(SCN), with M=K and Rb. They exhibit a phase transition of the density wave type at TDW=8-10K and 12-13K respectively, evidenced by magnetoresistivity, specific heat, NMR and Hall constant measurements. The structural study shows the presence of satellite reflections already at ambient temperature. The related modulation is incommensurate with multiple harmonics. For some of the compounds studied, the intensity of the satellite reflections strongly increases below TDW. According to Fermi surface (FS) calculations, the wave vector of the structural modulation achieves a quite good nesting of the global FS. This suggests a coupling of the modulation with the electronic degrees of freedom leading to a charge density wave ground state.

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