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Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDT-TTF)_{2}Cu[N(CN)_{2}]Cl.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Matsuura, Masato Sasaki, Takahiko Iguchi, Satoshi Gati, Elena Müller, Jens Stockert, Oliver Piovano, Andrea Boehm, Martin Park, Jitae T. Biswas, Sananda Winter, Stephen M. Valent́ı, Roser Nakao, Akiko Lang, Michael |
| Copyright Year | 2019 |
| Abstract | Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)_{2}Cu[N(CN)_{2}]Cl reveal a phonon anomaly in a wide temperature range. Starting from T_{ins}∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature T_{N}=27 K, where also a ferroelectric ordering at T_{FE}≈T_{N} occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below T_{N}, while no change of the lattice symmetry is observed across T_{N} in neutron diffraction measurements. We assign the phonon anomalies to structural fluctuations coupled to charge and spin degrees of freedom in the BEDT-TTF molecules. |
| Starting Page | 027601 |
| Ending Page | 027601 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1103/PhysRevLett.123.027601 |
| PubMed reference number | 31386497 |
| Journal | Medline |
| Volume Number | 123 |
| Issue Number | 2 |
| Alternate Webpage(s) | https://arxiv.org/pdf/1906.08590v2.pdf |
| Alternate Webpage(s) | https://doi.org/10.1103/PhysRevLett.123.027601 |
| Journal | Physical review letters |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
