Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub>
We investigated the superconductivity of (TMTTF)<sub>2</sub>TaF<sub>6</sub> (TMTTF: tetramethyl-tetrathiafulvalene) by conducting resistivity measurements under high pressure up to 8 GPa. A cubic anvil cell (CAC) pressure generator, which can produce hydrostatic high-pressure...
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| Online Access: | https://www.mdpi.com/1996-1944/15/13/4638 |
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| author | Miho Itoi Toshikazu Nakamura Yoshiya Uwatoko |
| author_facet | Miho Itoi Toshikazu Nakamura Yoshiya Uwatoko |
| author_sort | Miho Itoi |
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| description | We investigated the superconductivity of (TMTTF)<sub>2</sub>TaF<sub>6</sub> (TMTTF: tetramethyl-tetrathiafulvalene) by conducting resistivity measurements under high pressure up to 8 GPa. A cubic anvil cell (CAC) pressure generator, which can produce hydrostatic high-pressure, was used for this study. Since the generalized temperature-pressure (<i>T</i>-<i>P</i>) diagram of (TMT<i>C</i>F)<sub>2</sub><i>X</i> (<i>C</i> = Se, S, <i>X</i>: monovalent anion) based on (TMTTF)<sub>2</sub>PF<sub>6</sub> (<i>T</i><sub>CO</sub> = 70 K and spin-Peierls: SP, <i>T</i><sub>SP</sub> = 15 K) was proposed by Jérome, exploring superconductivity states using high-pressure measurement beyond 4 GPa has been required to confirm the universality of the electron-correlation variation under pressure in (TMTTF)<sub>2</sub><i>X</i> (TMTTF)<sub>2</sub>TaF<sub>6</sub>, which has the largest octahedral-symmetry counter anion TaF<sub>6</sub> in the (TMTTF)<sub>2</sub><i>X</i> series, possesses the highest charge-ordering (CO) transition temperature (<i>T</i><sub>CO</sub> = 175 K) in (TMTTF)<sub>2</sub><i>X</i> and demonstrates an anti-ferromagnetic transition (<i>T</i><sub>AF</sub> = 9 K) at ambient pressure. A superconducting state in (TMTTF)<sub>2</sub>TaF<sub>6</sub> emerged after a metal-insulator transition was suppressed with increasing external pressure. We discovered a superconducting state in 5 ≤ <i>P</i> ≤ 6 GPa from <i>T</i><sub>c</sub> = 2.1 K to 2.8 K, whose pressure range is one-third narrower than that of <i>X</i> = SbF<sub>6</sub> (5.4 ≤ <i>P</i> ≤ 9 GPa). In addition, when the pressures with maximum SC temperatures are compared between the PF<sub>6</sub> and the TaF<sub>6</sub> salts, we found that (TMTTF)<sub>2</sub>TaF<sub>6</sub> has a 0.75 GPa on the negative pressure side in the <i>T</i>-<i>P</i> phase diagram of (TMTTF)<sub>2</sub>PF<sub>6</sub>. |
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| last_indexed | 2024-03-09T04:02:42Z |
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| spelling | doaj.art-9284038742e04fef9f6023bd2143c83d2023-12-03T14:10:57ZengMDPI AGMaterials1996-19442022-07-011513463810.3390/ma15134638Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub>Miho Itoi0Toshikazu Nakamura1Yoshiya Uwatoko2Physics Section, Division of Natural Sciences, Nihon University School of Medicine, Itabashi 173-8610, JapanInstitute for Molecular Science, Okazaki 444-8585, JapanInstitute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, JapanWe investigated the superconductivity of (TMTTF)<sub>2</sub>TaF<sub>6</sub> (TMTTF: tetramethyl-tetrathiafulvalene) by conducting resistivity measurements under high pressure up to 8 GPa. A cubic anvil cell (CAC) pressure generator, which can produce hydrostatic high-pressure, was used for this study. Since the generalized temperature-pressure (<i>T</i>-<i>P</i>) diagram of (TMT<i>C</i>F)<sub>2</sub><i>X</i> (<i>C</i> = Se, S, <i>X</i>: monovalent anion) based on (TMTTF)<sub>2</sub>PF<sub>6</sub> (<i>T</i><sub>CO</sub> = 70 K and spin-Peierls: SP, <i>T</i><sub>SP</sub> = 15 K) was proposed by Jérome, exploring superconductivity states using high-pressure measurement beyond 4 GPa has been required to confirm the universality of the electron-correlation variation under pressure in (TMTTF)<sub>2</sub><i>X</i> (TMTTF)<sub>2</sub>TaF<sub>6</sub>, which has the largest octahedral-symmetry counter anion TaF<sub>6</sub> in the (TMTTF)<sub>2</sub><i>X</i> series, possesses the highest charge-ordering (CO) transition temperature (<i>T</i><sub>CO</sub> = 175 K) in (TMTTF)<sub>2</sub><i>X</i> and demonstrates an anti-ferromagnetic transition (<i>T</i><sub>AF</sub> = 9 K) at ambient pressure. A superconducting state in (TMTTF)<sub>2</sub>TaF<sub>6</sub> emerged after a metal-insulator transition was suppressed with increasing external pressure. We discovered a superconducting state in 5 ≤ <i>P</i> ≤ 6 GPa from <i>T</i><sub>c</sub> = 2.1 K to 2.8 K, whose pressure range is one-third narrower than that of <i>X</i> = SbF<sub>6</sub> (5.4 ≤ <i>P</i> ≤ 9 GPa). In addition, when the pressures with maximum SC temperatures are compared between the PF<sub>6</sub> and the TaF<sub>6</sub> salts, we found that (TMTTF)<sub>2</sub>TaF<sub>6</sub> has a 0.75 GPa on the negative pressure side in the <i>T</i>-<i>P</i> phase diagram of (TMTTF)<sub>2</sub>PF<sub>6</sub>.https://www.mdpi.com/1996-1944/15/13/4638one-dimensional organic conductorsuperconductivityhigh-pressure measurement |
| spellingShingle | Miho Itoi Toshikazu Nakamura Yoshiya Uwatoko Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> Materials one-dimensional organic conductor superconductivity high-pressure measurement |
| title | Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> |
| title_full | Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> |
| title_fullStr | Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> |
| title_full_unstemmed | Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> |
| title_short | Pressure-Induced Superconductivity of the Quasi-One-Dimensional Organic Conductor (TMTTF)<sub>2</sub>TaF<sub>6</sub> |
| title_sort | pressure induced superconductivity of the quasi one dimensional organic conductor tmttf sub 2 sub taf sub 6 sub |
| topic | one-dimensional organic conductor superconductivity high-pressure measurement |
| url | https://www.mdpi.com/1996-1944/15/13/4638 |
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