Differential thermal analysis of the field induced phase transitions of (TMTSF)2ClO4 above 1.2 K |
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| Institution: | 1. School of Computational Science and Electronics, Hunan Institute of Engineering, Xiangtan 411104, China;2. School of Physics and Electronics, Hunan University, Changsha 410082, China;1. School of Physics and Technology, Nantong University, Nantong, 226019, China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China;3. Research Center for Quantum Physics and Materials, Nantong University, Nantong, 226019, China;4. Nantong High School, Nantong, 226001, China |
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| Abstract: | We present some results of a differential thermal analysis of the magnetic field induced phase transitions in the organic conductor (TMTSF)2ClO4 above 1.2 K. This study shows that transitions between different spin density wave states are first order and that the total entropy change involved in the two detected transitions (in the temperature range 1.2–2 K) is close to that of the quasi-one-dimensional electron gas. Above 2 and 4.2 K, only a single transition has been detected in our measurements. The entropy of that transition decreases and extrapolates to zero near 5 K. We present some arguments suggesting that if longitudinal nesting (2kF, 0, 0) is to take place in the semi-metallic SDW phase at high fields it exists only above 2 K or so. |
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