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The metal-insulator transition in the organic conductor β"-(BEDT-TTF)2Hg(SCN)2Cl.
- Source :
-
Journal of Chemical Physics . 2017, Vol. 147 Issue 6, p1-9. 9p. 1 Diagram, 1 Chart, 8 Graphs. - Publication Year :
- 2017
-
Abstract
- We explore the nature of the metal-insulator transition in the two-dimensional organic compound β"-(BEDT-TTF)2Hg(SCN)2Cl by x-ray, electrical transport, ESR, Raman, and infrared investigations. Magnetic and vibrational spectroscopy concurrently reveal a gradual dimerization along the stacking direction (a-b)(a-b), setting in already at the crossover temperature of 150 K from the metallic to the insulating state. A spin gap of Δσ=47 meV is extracted. From the activated resistivity behavior below T = 55 K, a charge gap of Δρ=60 meV is derived. At TCO = 72 K, the C=C vibrational modes reveal the development of a charge-ordered state with a charge disproportionation of 2δρ=0.34e. In addition to a slight structural dimerization, charge-order causes stripes most likely perpendicular to the stacks. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 147
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 124662867
- Full Text :
- https://doi.org/10.1063/1.4997198