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Inhomogeneous site charges at the boundary between the insulating, superconducting, and metallic phases of beta '-type bis-ethylenedithio-tetrathiafulvalene molecular charge-transfer salts
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Yamamoto, T., Yamamoto, Hiroshi M., Kato, Reizo, Uruichi, Mikio, Yakushi, Kyuya, Akutsu, Hiroki, Sato-Akutsu, Akane, Kawamoto, Atsushi, Turner, S. S. (Scott S.) and Day, P. (Peter) (2008) Inhomogeneous site charges at the boundary between the insulating, superconducting, and metallic phases of beta '-type bis-ethylenedithio-tetrathiafulvalene molecular charge-transfer salts. Physical Review B (Condensed Matter and Materials Physics), Vol.77 (No.20). doi:10.1103/PhysRevB.77.205120 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.77.205120
Abstract
We have examined time-averaged charges of the molecular donors around the phase boundary between the insulating, superconducting, and metal phases for beta ''-type ET [ET=bis-ethelenedithio-tetrathiafulvalene] salts with one (two) hole(s) per two (three) molecules by using vibrational spectroscopy. Around the phase boundary, the site charges are neither those expected for a well-developed charge-ordered (CO) state nor a homogeneous distribution. The molecular charges exhibit an inhomogeneous distribution just above the insulator-superconductor transition temperature. We have analyzed the distribution of the site charges from the viewpoint of the alternation of intersite Coulomb interactions along the stacking direction. The closeness in the energy of several CO patterns mostly contributes to the inhomogeneous distribution, whereas a large difference (no difference) in the energy levels contributes to the CO (homogeneous) state. Our observations indicate that the instability due to the closeness in the energy of several distributions correlates with the insulator-superconductor transition in nondimerized or weakly dimerized molecular conductors.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Charge transfer, Salts, Phase rule and equilibrium | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | May 2008 | ||||
Dates: |
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Volume: | Vol.77 | ||||
Number: | No.20 | ||||
Number of Pages: | 14 | ||||
DOI: | 10.1103/PhysRevB.77.205120 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (JSPS), Japan. Monbu Kagakushō [Japan. Ministry of Education, Culture, Sports, Science and Technology] (MEXT), Engineering and Physical Sciences Research Council (EPSRC), Royal Society (Great Britain) | ||||
Grant number: | 05J04172 (JSPS), 15073223 (MEXT), 16GS0219� (MEXT) |
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