Light, pressure, and stress induced phase transitions of deuterated Cu(DCNQI) 2 radical ion salts

The extremely sharp metal-insulator phase transition at T c = 60 K of 6-fold deuterated Cu(DCNQI) 2 could be shifted to lower temperature T by illumination with light and by mechanical tension, both acting contrarily to the application of pressure. By proper selection of T, using pressure cycles, th...

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Bibliographic Details
Published in:Synthetic metals 1997-02, Vol.86 (1), p.2257-2258
Main Authors: Schmitt, H., von Schütz, J.U., Wachtel, H., Wolf, H.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity
Electrocrystallization
Electron states
Exact sciences and technology
Metal-insulator transitions
Metal-insulator transitions and other electronic transitions
Organic conductors
Physics
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Summary:The extremely sharp metal-insulator phase transition at T c = 60 K of 6-fold deuterated Cu(DCNQI) 2 could be shifted to lower temperature T by illumination with light and by mechanical tension, both acting contrarily to the application of pressure. By proper selection of T, using pressure cycles, the samples could be switched to a persistent insulating state. Applying light (of different wavelengths) we could reestablish the conductivity. Correlating the temperature dependence of the crystal; length (interferometric, resolution Δ1/1 < 10 −5) with that of the conductivity clearly demonstrates by the smooth change of the crystal length the model of connectivity limited conductivity between the noninverted still metallic microdomains.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(97)81116-2