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  Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl

Matsuura, M., Sasaki, T., Iguchi, S., Gati, E., Müller, J., Stockert, O., et al. (2019). Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl. Physical Review Letters, 123(2): 027601, pp. 1-6. doi:10.1103/PhysRevLett.123.027601.

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Matsuura, Masato1, Autor
Sasaki, Takahiko1, Autor
Iguchi, Satoshi1, Autor
Gati, Elena1, Autor
Müller, Jens1, Autor
Stockert, Oliver2, Autor           
Piovano, Andrea1, Autor
Böhm, Martin1, Autor
Park, Jitae T.1, Autor
Biswas, Sananda1, Autor
Winter, Stephen M.1, Autor
Valentí, Roser1, Autor
Nakao, Akiko1, Autor
Lang, Michael1, Autor
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Zusammenfassung: 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-ins similar to 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 approximate to 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.

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Sprache(n): eng - English
 Datum: 2019-07-102019-07-10
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000474895000023
DOI: 10.1103/PhysRevLett.123.027601
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Titel: Physical Review Letters
  Kurztitel : Phys. Rev. Lett.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Physical Society
Seiten: - Band / Heft: 123 (2) Artikelnummer: 027601 Start- / Endseite: 1 - 6 Identifikator: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1