Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub>
The quantum spin liquid candidate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>-(BEDT-TTF)<inline-formula><math xmlns="http:...
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| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/7/817 |
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| author | Yohei Saito Anja Löhle Atsushi Kawamoto Andrej Pustogow Martin Dressel |
| author_facet | Yohei Saito Anja Löhle Atsushi Kawamoto Andrej Pustogow Martin Dressel |
| author_sort | Yohei Saito |
| collection | DOAJ |
| description | The quantum spin liquid candidate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>-(BEDT-TTF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>(CN)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> has been established as the prime example of a genuine Mott insulator that can be tuned across the first-order insulator–metal transition either by chemical substitution or by physical pressure. Here, we explore the superconducting state that occurs at low temperatures, when both methods are combined, i.e., when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>-[(BEDT-TTF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula>(BEDT-STF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>x</mi></msub></semantics></math></inline-formula>]<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>(CN)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> is pressurized. We discovered superconductivity for partial BEDT-STF substitution with <i>x</i> = 0.10–0.12 even at ambient pressure, i.e., a superconducting state is realized in the range between a metal and a Mott insulator without magnetic order. Furthermore, we observed the formation of a superconducting dome by pressurizing the substituted crystals; we assigned this novel behavior to disorder emanating from chemical tuning. |
| first_indexed | 2024-03-10T09:41:54Z |
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| id | doaj.art-327d61df284f4278ab8a9dcb5fa85644 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T09:41:54Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-327d61df284f4278ab8a9dcb5fa856442023-11-22T03:33:34ZengMDPI AGCrystals2073-43522021-07-0111781710.3390/cryst11070817Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub>Yohei Saito0Anja Löhle1Atsushi Kawamoto2Andrej Pustogow3Martin Dressel41. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, GermanyDepartment of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, GermanyThe quantum spin liquid candidate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>-(BEDT-TTF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>(CN)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> has been established as the prime example of a genuine Mott insulator that can be tuned across the first-order insulator–metal transition either by chemical substitution or by physical pressure. Here, we explore the superconducting state that occurs at low temperatures, when both methods are combined, i.e., when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>-[(BEDT-TTF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula>(BEDT-STF)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>x</mi></msub></semantics></math></inline-formula>]<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>(CN)<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> is pressurized. We discovered superconductivity for partial BEDT-STF substitution with <i>x</i> = 0.10–0.12 even at ambient pressure, i.e., a superconducting state is realized in the range between a metal and a Mott insulator without magnetic order. Furthermore, we observed the formation of a superconducting dome by pressurizing the substituted crystals; we assigned this novel behavior to disorder emanating from chemical tuning.https://www.mdpi.com/2073-4352/11/7/817charge-transfer saltsBEDT-TTF saltspressure-dependent transportmetal–insulator transitionsuperconductivity |
| spellingShingle | Yohei Saito Anja Löhle Atsushi Kawamoto Andrej Pustogow Martin Dressel Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> Crystals charge-transfer salts BEDT-TTF salts pressure-dependent transport metal–insulator transition superconductivity |
| title | Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> |
| title_full | Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> |
| title_fullStr | Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> |
| title_full_unstemmed | Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> |
| title_short | Pressure-Tuned Superconducting Dome in Chemically-Substituted <i>κ</i>-(BEDT-TTF)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub> |
| title_sort | pressure tuned superconducting dome in chemically substituted i κ i bedt ttf sub 2 sub cu sub 2 sub cn sub 3 sub |
| topic | charge-transfer salts BEDT-TTF salts pressure-dependent transport metal–insulator transition superconductivity |
| url | https://www.mdpi.com/2073-4352/11/7/817 |
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