Lattice dynamics coupled to charge and spin degrees of freedom in the molecular dimer-Mott insulator \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu[N(CN)\(_{2}\)]Cl
Inelastic neutron scattering measurements on the molecular dimer-Mott insulator \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu[N(CN)\(_{2}\)]Cl reveal a phonon anomaly in a wide temperature range. Starting from \(T_{\rm ins}\sim50\)-\(60\) K where the charge gap opens, the low-lying optical phonon modes become ove...
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| creator | Matsuura, Masato Sasaki, Takahiko Iguchi, Satoshi Gati, Elena Müller, Jens Stockert, Oliver Piovano, Andrea Böhm, Martin Park, Jitae T Biswas, Sananda Winter, Stephen M Valentí, Roser Nakao, Akiko Lang, Michael |
| description | Inelastic neutron scattering measurements on the molecular dimer-Mott insulator \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu[N(CN)\(_{2}\)]Cl reveal a phonon anomaly in a wide temperature range. Starting from \(T_{\rm ins}\sim50\)-\(60\) K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature \(T_\mathrm{N} = 27\) K, where also a ferroelectric ordering at \(T_{\rm FE} \approx T_{\rm N}\) occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below \(T_\mathrm{N}\), while no change of the lattice symmetry is observed across \(T_\mathrm{N}\) 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. |
| doi_str_mv | 10.48550/arxiv.1906.08590 |
| format | Article |
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Starting from \(T_{\rm ins}\sim50\)-\(60\) K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature \(T_\mathrm{N} = 27\) K, where also a ferroelectric ordering at \(T_{\rm FE} \approx T_{\rm N}\) occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below \(T_\mathrm{N}\), while no change of the lattice symmetry is observed across \(T_\mathrm{N}\) in neutron diffraction measurements. 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We assign the phonon anomalies to structural fluctuations coupled to charge and spin degrees of freedom in the BEDT-TTF molecules.</description><subject>Anomalies</subject><subject>Antiferromagnetism</subject><subject>Coupling (molecular)</subject><subject>Damping</subject><subject>Degrees of freedom</subject><subject>Dimers</subject><subject>Ferroelectric materials</subject><subject>Ferroelectricity</subject><subject>Inelastic scattering</subject><subject>Lattice vibration</subject><subject>Neutron diffraction</subject><subject>Neutron scattering</subject><subject>Neutrons</subject><subject>Phonons</subject><subject>Spin dynamics</subject><subject>Temperature</subject><subject>Variation</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNir1OwzAUhS0kJCroA7BdiSUZEhzHLulKaMUAnbIRFFnxTZuSxME_CIR4DN4XD4iZ6ZzzfYeQy4ymvBCCXkvz3r-l2ZquUlqINT0hC5bnWVJwxs7I0tojpZStbpgQ-YJ8P0jn-hZBfUxy7FsLrfbzgAqchvYgzR5BTgrs3E-gcG8QLegOulCUHiFQd0AY9YCtH6QB1Y9okkftXHA2IKcN1FH9IudZ1nES3W7uqqSqtnEdNZ_sq45L_7SLyt3ffi6HC3LaycHi8jfPydV2U5X3yWz0q0frmqP2ZgqqYYxzLjjNWP6_1w8nyVuB</recordid><startdate>20201214</startdate><enddate>20201214</enddate><creator>Matsuura, Masato</creator><creator>Sasaki, Takahiko</creator><creator>Iguchi, Satoshi</creator><creator>Gati, Elena</creator><creator>Müller, Jens</creator><creator>Stockert, Oliver</creator><creator>Piovano, Andrea</creator><creator>Böhm, Martin</creator><creator>Park, Jitae T</creator><creator>Biswas, Sananda</creator><creator>Winter, Stephen M</creator><creator>Valentí, Roser</creator><creator>Nakao, Akiko</creator><creator>Lang, Michael</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20201214</creationdate><title>Lattice dynamics coupled to charge and spin degrees of freedom in the molecular dimer-Mott insulator \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu[N(CN)\(_{2}\)]Cl</title><author>Matsuura, Masato ; 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Starting from \(T_{\rm ins}\sim50\)-\(60\) K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature \(T_\mathrm{N} = 27\) K, where also a ferroelectric ordering at \(T_{\rm FE} \approx T_{\rm N}\) occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below \(T_\mathrm{N}\), while no change of the lattice symmetry is observed across \(T_\mathrm{N}\) 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.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1906.08590</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Anomalies Antiferromagnetism Coupling (molecular) Damping Degrees of freedom Dimers Ferroelectric materials Ferroelectricity Inelastic scattering Lattice vibration Neutron diffraction Neutron scattering Neutrons Phonons Spin dynamics Temperature Variation |
| title | Lattice dynamics coupled to charge and spin degrees of freedom in the molecular dimer-Mott insulator \(\kappa\)-(BEDT-TTF)\(_{2}\)Cu[N(CN)\(_{2}\)]Cl |
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