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ESR study on low-dimensional antiferromagnets α-(BEDT-TTF)2PF6 and ζ-(BEDT-TTF)2PF6(THF)
- Source :
- Synthetic Metals. 152:453-456
- Publication Year :
- 2005
- Publisher :
- Elsevier BV, 2005.
-
Abstract
- ESR measurements were carried out for α-(BEDT-TTF) 2 PF 6 and ζ-(BEDT-TTF) 2 PF 6 (THF). The temperature dependences of the spin susceptibility of the two salts are very similar to each other and seem to behave as typical paramagnetic insulators with low-dimensional antiferromagnetic interaction. The absolute values of the macroscopic antiferromagnetic interaction, J/k B , are also very close. However, there are obvious differences in their ground states and microscopic behaviors. ζ-(BEDT-TTF) 2 PF 6 (THF) undergoes an antiferromagnetic transition at around 5 K., while α-(BEDT-TTF) 2 PF 6 shows no long-range magnetic ordering down to 2 K. The temperature dependent behaviors of the ESR linewidth, Δ H PP , are quite different: The Δ H PP of ζ-(BEDT-TTF) 2 PF 6 (THF) is almost temperature independent in the paramagnetic region and shows an abrupt increase below about 30 K, while the Δ H PP of ζ-(BEDT-TTF) 2 PF 6 gradually decreases as the temperature decreases. The low temperature electronic states of these salts are discussed from the microscopic point of view.
- Subjects :
- Condensed matter physics
Mechanical Engineering
Metals and Alloys
Temperature independent
Condensed Matter Physics
Magnetic susceptibility
Electronic, Optical and Magnetic Materials
law.invention
Electronic states
Crystallography
chemistry.chemical_compound
Paramagnetism
chemistry
Mechanics of Materials
law
Materials Chemistry
Antiferromagnetism
Electron paramagnetic resonance
Spin (physics)
Tetrahydrofuran
Subjects
Details
- ISSN :
- 03796779
- Volume :
- 152
- Database :
- OpenAIRE
- Journal :
- Synthetic Metals
- Accession number :
- edsair.doi...........7747e28c3ea405c241d3ba8a339aac2b