Comparative transport and thermal expansion studies on quasi-2D organic superconductors close to the metal-to-insulator transition
| Autor: | A. Brühl, John A. Schlueter, Christian Strack, Bernd Wolf, Jens Müller, Michael Lang, Dieter Schweitzer, Mariano de Souza |
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| Rok vydání: | 2007 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Energy Engineering and Power Technology Condensed Matter Physics Thermal expansion Electronic Optical and Magnetic Materials Mott transition Metal Electrical resistivity and conductivity Lattice (order) visual_art visual_art.visual_art_medium Electrical and Electronic Engineering Metal–insulator transition Phase diagram |
| Zdroj: | Physica C: Superconductivity and its Applications. :129-132 |
| ISSN: | 0921-4534 |
| Popis: | A deuterated crystal of κ -(BEDT-TTF) 2 Cu[N(CN) 2 ]Br has been studied by high-resolution thermal expansion and resistivity measurements. This crystal is found to be situated close to the critical pressure which marks the end point of the first-order metal-to-insulator transition in the generalized phase diagram of κ -(BEDT-TTF) 2 X. The in-plane a -axis expansion coefficient reveals a distinct anomaly at 30 K which is attributed to the anomalous lattice response upon approaching the first-order metal-to-insulator transition. This feature is shown to be intimately related to the anomaly at T ∗ ≈ 40 K for the hydrogenated salt. |
| Databáze: | OpenAIRE |
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