Control of electronic state in organic conductors by systematic band filling |
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| Institution: | 1. International Superconductivity Technology Center (ISTEC), Tokyo 135-0062, Japan;2. Department of Physics, Faculty of Science, Toho University, Chiba 274-8510, Japan;3. Department of Chemistry, Faculty of Science, Toho University, Chiba 274-8510, Japan;1. New Materials Research Group, College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China;2. Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States;3. Sandia National Laboratories, 7011 East Avenue, Livermore, CA 94551-0969, United States;4. Department of Material Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States;1. School of Material Science and Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Dingzigu Road 1, Tianjin, 300130, China;2. Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, Hannover, 30167, Germany;1. Suleyman Demirel University, Faculty of Arts and Science, Department of Chemistry, 32260, Isparta, Turkey;2. Ordu University, Faculty of Arts and Science, Department of Chemistry, 52200, Ordu, Turkey;1. Departments of Dermatology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA;2. Environmental Health Sciences, University of Alabama at Birmingham, Birmingham, AL, 35294, USA;3. Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, 35294, USA;4. Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, 35294, USA;5. Birmingham Veterans Affairs Medical Center, Birmingham, AL, 35233, USA |
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| Abstract: | Organic superconductors have been usually obtained by the bandwidth control of antiferromagnetic insulator. In order to find another parameter to control the electronic state, the band filling control has been applied to obtain the carrier-controlled organic conductors. As a result, the systematic band filling control for four kinds of organic conductors has been succeeded. The obtained crystals were (a) 2:1 salts, λ-ET2(GaCl41−)1−x(CoCl42−)x ET=bis(ethylenedithio)tetrathiafulvalene], doping to the antiferromagnetic insulator, (b) 2:1 salts, δ′-ET2(GaCl4)1−x(CoCl4)x, doping to the non-magnetic insulator, (c) 3:1 salts, α-ET3(CoCl4)1−x(GaCl4)x(TCE), doping to the charge ordered salt, and (d) 3:2 salts, β′-ET3(CoCl4)2−x(GaCl4)x, doping to the half-filled band insulator. For both 2:1 salts, (a) and (b), the semiconducting behaviors have transferred to relatively conductive semiconducting ones by doping. The largest change of transport property is observed for (d) β′-phase from semiconducting behavior of parent material to metallic ones β′-ET3(CoCl4)2−x(GaCl4)x (x=0.88, 0.66)] down to 140 and 100 K, respectively.These systematic band filling control suggests that the doping to the 1/2-filled band insulator is most effective. |
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