Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application
Heat capacity measurements of θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> in its non-equilibrium electronic states induced by applying electric currents and voltages were performed by a modified relaxation calorimetry technique. We developed a single crystal heat capacity m...
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MDPI AG
2020-11-01
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| author | Kosei Hino Tetsuya Nomoto Satoshi Yamashita Yasuhiro Nakazawa |
| author_facet | Kosei Hino Tetsuya Nomoto Satoshi Yamashita Yasuhiro Nakazawa |
| author_sort | Kosei Hino |
| collection | DOAJ |
| description | Heat capacity measurements of θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> in its non-equilibrium electronic states induced by applying electric currents and voltages were performed by a modified relaxation calorimetry technique. We developed a single crystal heat capacity measurements system by which the Joule heating produced in samples by external currents and voltages can be balanced with the cooling power to make a non-equilibrium steady state. Although temperature versus time profiles in the relaxation process in calorimetry can be obtained as exponential curves as in the usual relaxation technique, we found that the change of resistivity that occurs during the heating and relaxation process should be taken into account in analyzing the data. By correcting this factor in the analyses, we succeeded in evaluating absolute values of <i>C<sub>p</sub></i>(<i>I</i>) and <i>C<sub>p</sub></i>(<i>V</i>) in these non-equilibrium states. The experiments up to 150 μA and the constant voltage of 20 mV do not induce visible change in the structure of the Boson peak in <i>C<sub>p</sub>T</i><sup>−3</sup> vs. <i>T</i> suggestive of the glassy ground state of phonons. Although the suppression of the short-range fluctuations of the charge density has been reported, it does not seriously affect the glassy phonons in this current range. |
| first_indexed | 2024-03-10T14:39:56Z |
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| language | English |
| last_indexed | 2024-03-10T14:39:56Z |
| publishDate | 2020-11-01 |
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| series | Crystals |
| spelling | doaj.art-67574385ffd442a690312b9baae1c5052023-11-20T21:51:12ZengMDPI AGCrystals2073-43522020-11-011011106010.3390/cryst10111060Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage ApplicationKosei Hino0Tetsuya Nomoto1Satoshi Yamashita2Yasuhiro Nakazawa3Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanHeat capacity measurements of θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> in its non-equilibrium electronic states induced by applying electric currents and voltages were performed by a modified relaxation calorimetry technique. We developed a single crystal heat capacity measurements system by which the Joule heating produced in samples by external currents and voltages can be balanced with the cooling power to make a non-equilibrium steady state. Although temperature versus time profiles in the relaxation process in calorimetry can be obtained as exponential curves as in the usual relaxation technique, we found that the change of resistivity that occurs during the heating and relaxation process should be taken into account in analyzing the data. By correcting this factor in the analyses, we succeeded in evaluating absolute values of <i>C<sub>p</sub></i>(<i>I</i>) and <i>C<sub>p</sub></i>(<i>V</i>) in these non-equilibrium states. The experiments up to 150 μA and the constant voltage of 20 mV do not induce visible change in the structure of the Boson peak in <i>C<sub>p</sub>T</i><sup>−3</sup> vs. <i>T</i> suggestive of the glassy ground state of phonons. Although the suppression of the short-range fluctuations of the charge density has been reported, it does not seriously affect the glassy phonons in this current range.https://www.mdpi.com/2073-4352/10/11/1060charge glassheat capacityelectric currentelectric voltageBoson peak |
| spellingShingle | Kosei Hino Tetsuya Nomoto Satoshi Yamashita Yasuhiro Nakazawa Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application Crystals charge glass heat capacity electric current electric voltage Boson peak |
| title | Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application |
| title_full | Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application |
| title_fullStr | Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application |
| title_full_unstemmed | Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application |
| title_short | Single Crystal Heat Capacity Measurement of Charge Glass Compound θ-(BEDT-TTF)<sub>2</sub>CsZn(SCN)<sub>4</sub> Performed under Current and Voltage Application |
| title_sort | single crystal heat capacity measurement of charge glass compound θ bedt ttf sub 2 sub cszn scn sub 4 sub performed under current and voltage application |
| topic | charge glass heat capacity electric current electric voltage Boson peak |
| url | https://www.mdpi.com/2073-4352/10/11/1060 |
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