Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements
The spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} [ET: bis(ethylenedithio)tetrathiafulvalene] does not exhibit magnetic ordering down to a very low temperature, but shows a mysterious anomaly at 6 K. The origin of the so-called 6-K anomaly is still under debate. We carried out nuclear quadrupole re...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-10-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.042023 |
| _version_ | 1827285924505976832 |
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| author | T. Kobayashi Q.-P. Ding H. Taniguchi K. Satoh A. Kawamoto Y. Furukawa |
| author_facet | T. Kobayashi Q.-P. Ding H. Taniguchi K. Satoh A. Kawamoto Y. Furukawa |
| author_sort | T. Kobayashi |
| collection | DOAJ |
| description | The spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} [ET: bis(ethylenedithio)tetrathiafulvalene] does not exhibit magnetic ordering down to a very low temperature, but shows a mysterious anomaly at 6 K. The origin of the so-called 6-K anomaly is still under debate. We carried out nuclear quadrupole resonance (NQR) measurements on the copper sites of the insulating layers, which are sensitive to the charge dynamics unlike conventional spin-1/2 nuclear magnetic resonance (NMR). The main finding of this Rapid Communication is that the observation of a sharp peak behavior in the nuclear spin-lattice relaxation rate T_{1}^{−1} of ^{63}Cu NQR at 6 K while T_{1}^{−1} of both ^{13}C and ^{1}H NMR show no clear anomaly. This behavior can be understood as a second-order phase transition related to charge disproportionation in the ET layers. |
| first_indexed | 2024-04-24T10:22:51Z |
| format | Article |
| id | doaj.art-6cc1dcd451974faabe8c2371bbbeb1c5 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:22:51Z |
| publishDate | 2020-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-6cc1dcd451974faabe8c2371bbbeb1c52024-04-12T17:03:19ZengAmerican Physical SocietyPhysical Review Research2643-15642020-10-012404202310.1103/PhysRevResearch.2.042023Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurementsT. KobayashiQ.-P. DingH. TaniguchiK. SatohA. KawamotoY. FurukawaThe spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} [ET: bis(ethylenedithio)tetrathiafulvalene] does not exhibit magnetic ordering down to a very low temperature, but shows a mysterious anomaly at 6 K. The origin of the so-called 6-K anomaly is still under debate. We carried out nuclear quadrupole resonance (NQR) measurements on the copper sites of the insulating layers, which are sensitive to the charge dynamics unlike conventional spin-1/2 nuclear magnetic resonance (NMR). The main finding of this Rapid Communication is that the observation of a sharp peak behavior in the nuclear spin-lattice relaxation rate T_{1}^{−1} of ^{63}Cu NQR at 6 K while T_{1}^{−1} of both ^{13}C and ^{1}H NMR show no clear anomaly. This behavior can be understood as a second-order phase transition related to charge disproportionation in the ET layers.http://doi.org/10.1103/PhysRevResearch.2.042023 |
| spellingShingle | T. Kobayashi Q.-P. Ding H. Taniguchi K. Satoh A. Kawamoto Y. Furukawa Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements Physical Review Research |
| title | Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements |
| title_full | Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements |
| title_fullStr | Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements |
| title_full_unstemmed | Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements |
| title_short | Charge disproportionation in the spin-liquid candidate κ-(ET)_{2}Cu_{2}(CN)_{3} at 6 K revealed by ^{63}Cu NQR measurements |
| title_sort | charge disproportionation in the spin liquid candidate κ et 2 cu 2 cn 3 at 6 k revealed by 63 cu nqr measurements |
| url | http://doi.org/10.1103/PhysRevResearch.2.042023 |
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